libxml2: use install-strip instead of install-exec for target install

Use install-strip so binaries gets stripped and man pages / header files
gets installed.

package/libxml2/libxml2.mk

@@ -10,6 +10,7 @@ LIBXML2_SITE = ftp://xmlsoft.org/libxml2
 LIBXML2_AUTORECONF = NO
 LIBXML2_INSTALL_STAGING = YES
 LIBXML2_INSTALL_TARGET = YES
+LIBXML2_INSTALL_TARGET_OPT:=DESTDIR=$(TARGET_DIR) install-strip
 
 ifneq ($(BR2_LARGEFILE),y)
 LIBXML2_CONF_ENV = CC="$(TARGET_CC) $(TARGET_CFLAGS) -DNO_LARGEFILE_SOURCE"
@@ -25,5 +26,7 @@ LIBXML2_DEPENDENCIES = uclibc
 $(eval $(call AUTOTARGETS,package,libxml2))
 
 $(LIBXML2_HOOK_POST_INSTALL):
-	$(STRIPCMD) $(STRIP_STRIP_UNNEEDED) $(TARGET_DIR)/usr/lib/libxml2*so*
+	rm -rf $(TARGET_DIR)/usr/share/aclocal \
+	       $(TARGET_DIR)/usr/share/doc/libxml2-$(LIBXML2_VERSION) \
+	       $(TARGET_DIR)/usr/share/gtk-doc
 	touch $@