* config/i386/cygwin-stdint.h: Add support for cygwin x64 target.
	* config/i386/t-cygwin-w64: New file.
	* config/i386/cygwin-w64.h: New file.
	* config/i386/cygwin.h (EXTRA_OS_CPP_BUILTINS): Extend
	and add support for x64-cygwin target.
	(CPP_SPEC): Likewise.
	(CXX_WRAP_SPEC_LIST): Undefine before define.
	(LIBGCJ_SONAME): Use 15 as version.

From-SVN: r197168