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_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"