x11r7/libXi: use install-strip for target install

Saves ~900 KB

package/x11r7/xlib_libXi/xlib_libXi.mk

@@ -9,6 +9,8 @@ XLIB_LIBXI_SOURCE = libXi-$(XLIB_LIBXI_VERSION).tar.bz2
 XLIB_LIBXI_SITE = http://xorg.freedesktop.org/releases/individual/lib
 XLIB_LIBXI_AUTORECONF = NO
 XLIB_LIBXI_INSTALL_STAGING = YES
+XLIB_LIBXI_INSTALL_TARGET = YES
+XLIB_LIBXI_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install-strip
 XLIB_LIBXI_DEPENDENCIES = xproto_inputproto xlib_libX11 xlib_libXext xproto_xproto
 XLIB_LIBXI_CONF_OPT = --disable-malloc0returnsnull --enable-shared --disable-static