enable shared lib support in linux for lua

gyp/tools.gyp

 # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
@@ skipping 80 matching lines @@
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'flags.gyp:flags',
         'gm.gyp:gm_expectations',
         'jsoncpp.gyp:jsoncpp',
         'utils.gyp:utils',
       ],
     },
     {
+      'target_name': 'sklua',
+      'type': 'shared_library',
+      'sources': [
+        '../src/utils/SkLuaCanvas.cpp',
+        '../src/utils/SkLua.cpp',
+      ],
+      'include_dirs': [
+        '../third_party/lua/src/',
+      ],
+      'dependencies': [
+        'lua.gyp:lua',
+        'pdf.gyp:pdf',
+        'skia_lib.gyp:skia_lib',
+      ],
+      'ldflags': [
+        '-Wl,-rpath', '-Wl,./',

[bungeman-skia, 2013/06/18 20:28:06]

is it possible to just use '-Wl,-rpath=./' to avoid splitting the flag? Also,
this seems ld specific, perhaps this should go in a conditional to not add this
on Windows (not sure if this is used on Windows anyway)?

+      ],
+    },
+    {
       'target_name': 'lua_app',
       'type': 'executable',
       'sources': [
         '../tools/lua/lua_app.cpp',
         '../src/utils/SkLua.cpp',
       ],
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'effects.gyp:effects',
         'utils.gyp:utils',
@@ skipping 232 matching lines @@
       },
     ],
   ],
 }
 
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