Fix for gcc-4.8.3 bootstrap failure with mingw32 native compiler
The currently released versions of gcc-4.8 was built without bootstrapping.
4.8.1 has "--disable-bootstrap" in configure.
4.8.2 is cross-built from Linux. According to GCC installation,
bootstrapping is not possible when building cross compiler.
I was able to bootstrap gcc-4.8.3 after applying only the patch below using
configure line as:
$ ../gcc-4.8.3/configure --enable-languages=c,c++ --disable-sjlj-exceptions
--enable-shared --enable-libgomp --disable-win32-registry
--build=mingw32 --prefix=/mingw --with-system-zlib