don't skip ffi_type_longdouble symbols (#814) (#824) Seems there are configurations (ppc64 or ppc64le) that define HAVE_LONG_DOUBLE_VARIANT in fficonfig.h, but do not define HAVE_LONG_DOUBLE, and still want ffi_type_{,complex_}longdouble symbols. Update the condition in libffi.map.in accordingly.