enable shared lib support in linux for lua

gyp/skia_lib.gyp

Index: gyp/skia_lib.gyp
diff --git a/gyp/skia_lib.gyp b/gyp/skia_lib.gyp
index f85c5ad1273bc7134c6c1c9428751e65c6214f05..9f1a738039c40ce99d97bf01ddb7d8b72af77a84 100644
--- a/gyp/skia_lib.gyp
+++ b/gyp/skia_lib.gyp
@@ -49,6 +49,12 @@
             }, {
               'product_name': 'skia',
             }],
+            [ 'skia_lua', {
+              'dependencies': [
+                'pdf.gyp:pdf',

[bungeman-skia, 2013/06/12 19:16:55]

We should at least have a comment here about how any dependencies other than
targets in lua.gyp here are because lua.gyp exposes them. This seems rather iffy
to me, as SkLua can, in theory, expose anything it wants, making skia_shared_lib
into skia_kitchen_sink_shared_lib. It has already shown that this complicates
any target in this list, as it should depend on skia_shared_lib, except when
it's in it, in which case it needs to depend on the things which are in the
non-lua skia_shared_lib.

+                'lua.gyp:lua',
+              ],
+            }],
           ],
           'type': 'shared_library',
         }, {