Convert gtk to directly link the .so files.

Change-Id: Ifb5a68f2ec2d4ede0326bff808f7ad4b42569c90
diff --git a/debian/usr.BUILD b/debian/usr.BUILD
index f39f8bb..97a3e9f 100644
--- a/debian/usr.BUILD
+++ b/debian/usr.BUILD
@@ -131,18 +131,18 @@
     'include/glib-2.0',
     'lib/x86_64-linux-gnu/glib-2.0/include',
   ],
-  linkopts = [
-    '-lgtk-3',
-    '-lgdk-3',
-    '-lpangocairo-1.0',
-    '-lpango-1.0',
-    '-latk-1.0',
-    '-lcairo-gobject',
-    '-lcairo',
-    '-lgdk_pixbuf-2.0',
-    '-lgio-2.0',
-    '-lgobject-2.0',
-    '-lglib-2.0'
+  srcs = [
+    'lib/x86_64-linux-gnu/libgtk-3.so',
+    'lib/x86_64-linux-gnu/libgdk-3.so',
+    'lib/x86_64-linux-gnu/libpangocairo-1.0.so',
+    'lib/x86_64-linux-gnu/libpango-1.0.so',
+    'lib/x86_64-linux-gnu/libatk-1.0.so',
+    'lib/x86_64-linux-gnu/libcairo-gobject.so',
+    'lib/x86_64-linux-gnu/libcairo.so',
+    'lib/x86_64-linux-gnu/libgdk_pixbuf-2.0.so',
+    'lib/x86_64-linux-gnu/libgio-2.0.so',
+    'lib/x86_64-linux-gnu/libgobject-2.0.so',
+    'lib/x86_64-linux-gnu/libglib-2.0.so',
   ],
   visibility = ['//visibility:public'],
 )