configure.ac: Also check if assembler supports pc-relative relocs on X86_WIN32 targets.

configure.ac: Also check if assembler supports pc-relative relocs on X86_WIN32 targets.

	* configure.ac:  Also check if assembler supports pc-relative
	relocs on X86_WIN32 targets.
	* configure:  Regenerate.
	* src/x86/win32.S (ffi_prep_args):  Declare extern, not global.
	(_ffi_call_SYSV):  Add missing function type symbol .def and
	add EH markup labels.
	(_ffi_call_STDCALL):  Likewise.
	(_ffi_closure_SYSV):  Likewise.
	(_ffi_closure_raw_SYSV):  Likewise.
	(.eh_frame):  Add hand-crafted EH data.

From-SVN: r147800