Build Skia as a static library

- Roll GYP so that we get non-thin archives on Linux
- Add merge_static_libs.py
- Add skia_core_lib target which builds core, ports, opts*, and utils
- Replace dependencies on core/ports/opts/utils with skia_core_libs
- Rename exportable libraries with "skia_"
Review URL: https://codereview.appspot.com/6619049

git-svn-id: http://skia.googlecode.com/svn/trunk@5889 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/gyp/gpu.gyp b/gyp/gpu.gyp
index 98ab257..0dc84ee 100644
--- a/gyp/gpu.gyp
+++ b/gyp/gpu.gyp
@@ -109,7 +109,9 @@
   'targets': [
     {
       'target_name': 'skgr',
+      'product_name': 'skia_skgr',
       'type': 'static_library',
+      'standalone_static_library': 1,
       'includes': [
         'gpu.gypi',
       ],
@@ -157,7 +159,9 @@
     },
     {
       'target_name': 'gr',
+      'product_name': 'skia_gr',
       'type': 'static_library',
+      'standalone_static_library': 1,
       'includes': [
         'gpu.gypi',
       ],