pixman: switch to using meson

Signed-off-by: Rosen Penev <rosenp@gmail.com>
Signed-off-by: Yousong Zhou <yszhou4tech@gmail.com>
(splits of commit)

libs/pixman/Makefile

@@ -21,8 +21,10 @@ PKG_LICENSE_FILES:=COPYING
 
 PKG_FIXUP:=autoreconf
 PKG_INSTALL:=1
+PKG_BUILD_DEPENDS:=meson/host
 
 include $(INCLUDE_DIR)/package.mk
+include ../../devel/meson/meson.mk
 
 
 define Package/pixman