enable shared lib support in linux for lua

gyp/utils.gyp

 {
   'targets': [
     {
       'target_name': 'utils',
       'product_name': 'skia_utils',
       'type': 'static_library',
       'standalone_static_library': 1,
       'include_dirs': [
         '../include/config',
         '../include/core',
@@ skipping 183 matching lines @@
           ],
           'sources!': [
             '../src/utils/SkThreadUtils_pthread_linux.cpp',
           ],
         }],
         [ 'skia_os == "android"', {
           'sources': [
             '../src/utils/android/ashmem.cpp',
           ],
         }],
+        [ 'skia_lua', {
+          'sources': [
+            '../src/utils/SkLuaCanvas.cpp',
+            '../src/utils/SkLua.cpp',
+          ],
+          'include_dirs': [
+            '../third_party/lua/src/',
+          ],
+        }],
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '../include/utils',
         ],
       },
     },
   ],
 }
 
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