python3: detect libraries in STAGING_LIBDIR

Patch setup.py so that the detect_modules() function looks for required
libraries and headers in STAGING_LIBDIR / STAGING_INCDIR.

Without this patch, several extension modules are not built, even though
their dependencies are present in the compiler's search paths.
The result is the following warning, and ultimately incomplete packages:

| The necessary bits to build these optional modules were not found:
| _bz2                  _curses_panel         _dbm
| _gdbm                 _lzma                 _sqlite3
| nis                   readline              zlib
| To find the necessary bits, look in setup.py in detect_modules() for the module's name.

With the Python 3.3 version of the recipe, at least some of these modules
were built, because STAGING_LIBDIR happened to be in the search path
by coincidence. Due to changes to distutils in Python 3.4, this is no
longer the case.

A previous patch that only affects the search paths for SSL is dropped, as
this one is a more complete fix for [YOCTO #7768].

Part of the fix for [YOCTO #8048].

(From OE-Core rev: 540a223fc0fb6b07dab3316de6236924bd97613c)

Signed-off-by: Dominic Sacré <dominic.sacre@gmx.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/python/python3/fix_ssl_include_dir.patch

@@ -1,41 +0,0 @@
-Upstream-Status:  Inappropriate [Embedded Specific]
-
-Python 3 fails to compile the ssl module, later, when requesting to install packages that should include such modules
-no error is shown; but a running python shell trying to import the ssl library results in an import error, 
-since it was never installed.
-
-This looks for the modules in the correct directories so they are corretcly compiled and installed along with python3.
-
-ImportError: No module named _ssl
-
-Signed-Off-By: Alejandro Hernandez <alejandro.hernandez@linux.intel.com>
-
-Index: Python-3.4.3/setup.py
-===================================================================
---- Python-3.4.3.orig/setup.py
-+++ Python-3.4.3/setup.py
-@@ -726,10 +726,9 @@ class PyBuildExt(build_ext):
-         exts.append( Extension('_socket', ['socketmodule.c'],
-                                depends = ['socketmodule.h']) )
-         # Detect SSL support for the socket module (via _ssl)
--        search_for_ssl_incs_in = [
--                              '/usr/local/ssl/include',
--                              '/usr/contrib/ssl/include/'
--                             ]
-+        search_for_ssl_incs_in = []
-+        for dir in [os.getenv("STAGING_INCDIR")]:
-+                search_for_ssl_incs_in.append(dir)
-         ssl_incs = find_file('openssl/ssl.h', inc_dirs,
-                              search_for_ssl_incs_in
-                              )
-@@ -739,9 +738,7 @@ class PyBuildExt(build_ext):
-             if krb5_h:
-                 ssl_incs += krb5_h
-         ssl_libs = find_library_file(self.compiler, 'ssl',lib_dirs,
--                                     ['/usr/local/ssl/lib',
--                                      '/usr/contrib/ssl/lib/'
--                                     ] )
-+                                     [os.getenv("STAGING_LIBDIR")])
- 
-         if (ssl_incs is not None and
-             ssl_libs is not None):

meta/recipes-devtools/python/python3/setup.py-find-libraries-in-staging-dirs.patch

@@ -0,0 +1,30 @@
+Patch setup.py so that the detect_modules() function looks for required
+libraries and headers in STAGING_LIBDIR / STAGING_INCDIR.
+
+Without this patch, several extension modules are not built, even though
+their dependencies are present in the compiler's search paths.
+The result is the following warning, and ultimately incomplete packages:
+
+| The necessary bits to build these optional modules were not found:
+| _bz2                  _curses_panel         _dbm
+| _gdbm                 _lzma                 _sqlite3
+| nis                   readline              zlib
+| To find the necessary bits, look in setup.py in detect_modules() for the module's name.
+
+Upstream-Status:  Inappropriate [Cross compile specific]
+
+Signed-off-by: Dominic Sacré <dominic.sacre@gmx.de>
+
+Index: Python-3.4.3/setup.py
+===================================================================
+--- Python-3.4.3.orig/setup.py
++++ Python-3.4.3/setup.py
+@@ -521,6 +521,8 @@ class PyBuildExt(build_ext):
+         else:
+             lib_dirs = self.compiler.library_dirs[:]
+             inc_dirs = self.compiler.include_dirs[:]
++            lib_dirs.append(os.environ.get('STAGING_LIBDIR'))
++            inc_dirs.append(os.environ.get('STAGING_INCDIR'))
+         exts = []
+         missing = []
+ 

meta/recipes-devtools/python/python3_3.4.3.bb

@@ -36,7 +36,7 @@ SRC_URI += "\
             file://python3-setup.py-no-host-headers-libs.patch \
             file://sysconfig.py-add-_PYTHON_PROJECT_SRC.patch \
             file://setup.py-check-cross_compiling-when-get-FLAGS.patch \
-            file://fix_ssl_include_dir.patch \
+            file://setup.py-find-libraries-in-staging-dirs.patch \
            "
 SRC_URI[md5sum] = "7d092d1bba6e17f0d9bd21b49e441dd5"
 SRC_URI[sha256sum] = "b5b3963533768d5fc325a4d7a6bd6f666726002d696f1d399ec06b043ea996b8"