Make extractors separate libraries

instead of being integrated into libstagefright

Test: thoroughly
Change-Id: I11cdfde6d2daf248c8e0f99237db1c74be260eb0
diff --git a/media/libmedia/Android.bp b/media/libmedia/Android.bp
index 93656a8..58ce17b 100644
--- a/media/libmedia/Android.bp
+++ b/media/libmedia/Android.bp
@@ -24,7 +24,7 @@
         "-Wno-error=deprecated-declarations",
         "-Wall",
     ],
-    shared_libs: ["libutils", "liblog", "libgui"],
+    shared_libs: ["libutils", "liblog"],
     header_libs: [
         "libmedia_headers",
         "libaudioclient_headers",