ffi.c (ffi_prep_cif_machdep <FFI_LINUX64>): Correct long double function return and long double arg handling.

	* src/powerpc/ffi.c (ffi_prep_cif_machdep <FFI_LINUX64>): Correct
	long double function return and long double arg handling.
	(ffi_closure_helper_LINUX64): Formatting.  Delete unused "ng" var.
	Use "end_pfr" instead of "nf".  Correct long double handling.
	Localise "temp".
	* src/powerpc/linux64.S (ffi_call_LINUX64): Save f2 long double
	return value.
	* src/powerpc/linux64_closure.S (ffi_closure_LINUX64): Allocate
	space for long double return value.  Adjust stack frame and offsets.
	Load f2 long double return.

From-SVN: r77481