fontconfig: use install-strip for target install

package/fontconfig/fontconfig.mk

@@ -10,7 +10,7 @@ FONTCONFIG_AUTORECONF = NO
 FONTCONFIG_INSTALL_STAGING = YES
 FONTCONFIG_INSTALL_TARGET = YES
 
-FONTCONFIG_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install
+FONTCONFIG_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install-strip
 
 FONTCONFIG_CONF_OPT = --with-arch=$(GNU_TARGET_NAME) \
 		--with-freetype-config="$(STAGING_DIR)/usr/bin/freetype-config" \