+ add libffi's cflags/ldflags to _ctypes_test.c deps

Author: skirpichev

PCbuild/_ctypes_test.vcxproj

@@ -87,6 +87,7 @@
   <ImportGroup Label="PropertySheets">
     <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
     <Import Project="pyproject.props" />
+    <Import Project="libffi.props" />
   </ImportGroup>
   <PropertyGroup Label="UserMacros" />
   <PropertyGroup>

configure

@@ -7790,7 +7790,7 @@ PY_STDLIB_MOD([xxsubtype], [test "$TEST_MODULES" = yes])
 PY_STDLIB_MOD([_xxtestfuzz], [test "$TEST_MODULES" = yes])
 PY_STDLIB_MOD([_ctypes_test],
   [test "$TEST_MODULES" = yes], [test "$have_libffi" = yes -a "$ac_cv_func_dlopen" = yes],
-  [], [$LIBM])
+  [$LIBFFI_CFLAGS], [$LIBFFI_LIBS $LIBM])
 
 dnl Limited API template modules.
 dnl Emscripten does not support shared libraries yet.