subversion: Add -P to CPPFLAGS

see https://gcc.gnu.org/gcc-5/porting_to.html

we need to stop the preprocessor from generating the #line directives
or we run into issues like

| checking for apr_int64_t Python/C API format string...
| configure: error: failed to recognize APR_INT64_T_FMT on this platform
| Configure failed. The contents of all config.log files follows to aid
debugging
| ERROR: oe_runconf failed

Rightly subversion should be fixed but lets leave that to subversion
folks

Change-Id: I02a89798ff949f79967ab0a73adcddaa4218662d
(From OE-Core rev: 7793b1c425077ed6ed11a9bc2a8b1b96612b1c96)

(From OE-Core rev: a240d28492f05c22198dd4b20c11c0d510f0c897)

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/subversion/subversion_1.8.11.bb

@@ -7,7 +7,7 @@ HOMEPAGE = "http://subversion.tigris.org"
 
 BBCLASSEXTEND = "native"
 
-inherit gettext
+inherit gettext pythonnative
 
 SRC_URI = "${APACHE_MIRROR}/${BPN}/${BPN}-${PV}.tar.bz2 \
            file://libtool2.patch \
@@ -31,6 +31,7 @@ EXTRA_OECONF = " \
 inherit autotools
 
 export LDFLAGS += " -L${STAGING_LIBDIR} "
+CPPFLAGS += "-P"
 
 acpaths = "-I build/ -I build/ac-macros/"