npapi: fetch gecko headers required for windows

(cherry picked from commit 6a6a6e9008e562d85d60907fac9c87d0e99859f3)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

extras/package/npapi.am

@@ -2,6 +2,10 @@
 
 build-npapi: stamp-npapi-build
 
+stamp-gecko-fetch:
+	svn export http://npapi-sdk.googlecode.com/svn/trunk/headers gecko -r HEAD
+	touch $@
+
 stamp-npapi-fetch:
 	rm -Rf npapi-vlc
 	git clone git://git.videolan.org/npapi-vlc.git npapi-vlc
@@ -19,7 +23,7 @@ else
 CONF_ACTIVEX =
 endif
 
-stamp-npapi-configure: stamp-npapi-autogen
+stamp-npapi-configure: stamp-npapi-autogen stamp-gecko-fetch
 	cd npapi-vlc && \
 	$(SHELL) ./configure \
 		--prefix=/ \
@@ -29,7 +33,7 @@ stamp-npapi-configure: stamp-npapi-autogen
 		CC="$(CC)" CFLAGS="$(CFLAGS)" \
 		CXX="$(CXX)" CXXFLAGS="$(CXXFLAGS)" \
 		LD="$(LD)" LDFLAGS="$(LDFLAGS)" \
-		MOZILLA_CFLAGS="-I$(CONTRIB_DIR)/gecko-sdk/include" \
+		MOZILLA_CFLAGS="-I$(abs_builddir)/gecko" \
 		SHELL="$(SHELL)" \
 		PKG_CONFIG_LIBDIR="../$(srcdir)/extras/contrib/lib/pkgconfig:../lib"
 	touch $@