pixman: cleanup staging + target install

- install-data installs a subset of install / install-strip, so just drop it
- use install-strip for target

package/pixman/pixman.mk

@@ -8,7 +8,7 @@ PIXMAN_SOURCE = pixman-$(PIXMAN_VERSION).tar.gz
 PIXMAN_SITE = http://cairographics.org/releases/
 PIXMAN_AUTORECONF = NO
 PIXMAN_INSTALL_STAGING = YES
-PIXMAN_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) install install-data
-PIXMAN_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install install-data
+PIXMAN_INSTALL_STAGING_OPT = DESTDIR=$(STAGING_DIR) install
+PIXMAN_INSTALL_TARGET_OPT = DESTDIR=$(TARGET_DIR) install-strip
 
 $(eval $(call AUTOTARGETS,package,pixman))