scons: Remove gles option.

It's broken, and WGL state tracker is always built with GLES support
noawadays.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Roland Scheidegger <sroland@vmware.com>

src/mapi/glapi/SConscript

@@ -19,12 +19,8 @@ if env['platform'] == 'windows':
         '_GDI32_', # prevent gl* being declared __declspec(dllimport) in MS headers
         'BUILD_GL32', # declare gl* as __declspec(dllexport) in Mesa headers
         'KHRONOS_DLL_EXPORTS', # declare gl* as __declspec(dllexport) in Khronos headers
+        '_GLAPI_NO_EXPORTS', # prevent _glapi_* from being declared __declspec(dllimport)
     ])
-    if env['gles']:
-        env.Append(CPPDEFINES = ['_GLAPI_DLL_EXPORTS'])
-    else:
-        # prevent _glapi_* from being declared __declspec(dllimport)
-        env.Append(CPPDEFINES = ['_GLAPI_NO_EXPORTS'])
 
 env.Append(CPPPATH = [
     '#/src',