x11r7/libXft: use install-strip for target install

Saves ~400 KB

package/x11r7/xlib_libXft/xlib_libXft.mk

@@ -9,6 +9,8 @@ XLIB_LIBXFT_SOURCE = libXft-$(XLIB_LIBXFT_VERSION).tar.bz2
 XLIB_LIBXFT_SITE = http://xorg.freedesktop.org/releases/individual/lib
 XLIB_LIBXFT_AUTORECONF = NO
 XLIB_LIBXFT_INSTALL_STAGING = YES
+XLIB_LIBXFT_INSTALL_TARGET = YES
+XLIB_LIBXFT_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install-strip
 XLIB_LIBXFT_DEPENDENCIES = fontconfig freetype xlib_libX11 xlib_libXext xlib_libXrender xproto_xproto
 XLIB_LIBXFT_CONF_OPT = --enable-shared --disable-static