configure.ac (HAVE_HIDDEN_VISIBILITY_ATTRIBUTE): New test.

	* configure.ac (HAVE_HIDDEN_VISIBILITY_ATTRIBUTE): New test.
	(AH_BOTTOM): Add FFI_HIDDEN definition.
	* configure: Rebuilt.
	* fficonfig.h.in: Rebuilt.
	* src/powerpc/ffi.c (hidden): Remove.
	(ffi_closure_LINUX64, ffi_prep_args64, ffi_call_LINUX64,
	ffi_closure_helper_LINUX64): Use FFI_HIDDEN instead of hidden.
	* src/powerpc/linux64_closure.S (ffi_closure_LINUX64,
	.ffi_closure_LINUX64): Use FFI_HIDDEN instead of .hidden.
	* src/x86/ffi.c (ffi_closure_SYSV, ffi_closure_raw_SYSV): Remove,
	add FFI_HIDDEN to its prototype.
	(ffi_closure_SYSV_inner): New.
	* src/x86/sysv.S (ffi_closure_SYSV, ffi_closure_raw_SYSV): New.
	* src/x86/win32.S (ffi_closure_SYSV, ffi_closure_raw_SYSV): New.

From-SVN: r103002