GCC-4 Build failure with GCC-4.3+

[Gedare Bloom]

While building 4.10 tools (gcc-4.4.7) with gcc 5.4, I stumbled on the issue discussed at ​https://bugzilla.redhat.com/show_bug.cgi?id=476370

The gcc build apparently needs -fgnu89-inline

I hacked the following fix locally in my 4.10 RSB branch, but am not sure of the appropriate long-term solution:

diff --git a/source-builder/config/gcc-common-1.cfg b/source-builder/config/gcc-common-1.cfg
index 941e15c..d2608ec 100644
--- a/source-builder/config/gcc-common-1.cfg
+++ b/source-builder/config/gcc-common-1.cfg
@@ -167,7 +167,7 @@ BuildRoot: %{_tmppath}/%{name}-root-%(%{__id_u} -n)
     cp ../${source_dir_gcc}/gcc/gsyslimits.h gcc/include/syslimits.h
   fi
 
-  %{__make} %{?_smp_mflags} all
+  %{__make} %{?_smp_mflags} CFLAGS="-fgnu89-inline" all
 
   cd ${build_top}