unix: add extra -I paths on macOS

Porting these from the normal macOS build.

Author: indygreg

cpython-unix/build-cpython.sh

@@ -104,6 +104,11 @@ mv tmp Modules/readline-libedit.c
 # Most bits look at CFLAGS. But setup.py only looks at CPPFLAGS.
 # So we need to set both.
 CFLAGS="-fPIC -I${TOOLS_PATH}/deps/include -I${TOOLS_PATH}/deps/include/ncurses"
+
+if [ "${PYBUILD_PLATFORM}" = "macos" ]; then
+    CFLAGS="${CFLAGS} -I${TOOLS_PATH}/deps/lib/libffi-3.2.1/include -I${TOOLS_PATH}/deps/include/uuid"
+fi
+
 CPPFLAGS=$CFLAGS
 LDFLAGS="-L${TOOLS_PATH}/deps/lib"