build-tk.sh drops EXTRA_TARGET_LDFLAGS for macos

[geofft]

CFLAGS="${EXTRA_TARGET_CFLAGS} -fPIC"
LDFLAGS="${EXTRA_TARGET_LDFLAGS}"

if [[ "${PYBUILD_PLATFORM}" = macos* ]]; then
    CFLAGS="${CFLAGS} -I${TOOLS_PATH}/deps/include -Wno-availability"
    CFLAGS="${CFLAGS} -Wno-deprecated-declarations -Wno-unknown-attributes -Wno-typedef-redefinition"
    LDFLAGS="-L${TOOLS_PATH}/deps/lib"
    EXTRA_CONFIGURE_FLAGS="--enable-aqua=yes --without-x"
else
    EXTRA_CONFIGURE_FLAGS="--x-includes=${TOOLS_PATH}/deps/include --x-libraries=${TOOLS_PATH}/deps/lib"
fi

CFLAGS="${CFLAGS}" CPPFLAGS="${CFLAGS}" LDFLAGS="${LDFLAGS}" ./configure \

I think this is a bug and it should be LDFLAGS="${LDFLAGS} -L${TOOLS_PATH}/deps/lib", but I don't want to roll this into #676 just in case it changes behavior in an interesting way.