enable shared lib support in linux for lua

gyp/pdf.gyp

 {
   'targets': [
     {
       'target_name': 'pdf',
       'product_name': 'skia_pdf',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
-        'skia_lib.gyp:skia_lib',

[djsollen, 2013/06/12 17:35:46]

why did we need to remove this?

[Zach Reizner, 2013/06/12 17:42:40]

I have it so pdf.gyp:pdf is included in skia_lib.gyp, which causes circular
reference errors. This change does not break the static lib build as far as I
can tell.

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

But you're only doing so if skia_lua is set? I don't like just removing this
without replacement anyway, the pdf target should state what it depends on. It
doesn't seem to break anything only because all of the current shared objects
(executables) which depend on pdf also happen to depend on most everything else.

         'zlib.gyp:zlib',
       ],
       'include_dirs': [
         '../include/config',
         '../include/core',
         '../include/images',
         '../include/pdf',
         '../src/core', # needed to get SkGlyphCache.h and SkTextFormatParams.h
         '../src/utils', # needed to get SkBitSet.h
       ],
@@ skipping 42 matching lines @@
       },
     },
   ],
 }
 
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