[Bug target/61407] Build errors on latest OS X 10.10 Yosemite with Xcode 6 on GCC 4.8.3

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61407

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Looks like the Mac OS X's headers are not C99/C++98 compatible at all:

/Applications/Xcode6-Beta.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.10.sdk/usr/include/Availability.h:174:44:
error: missing binary operator before token "("
 #if defined(__has_feature) &&
__has_feature(attribute_availability_with_message)
                                            ^