Bug 1134028 - Don't assign flags to file that may not be defined

The renderer/d3d/d3d11/SwapChain11.cpp source file is only defined if
building on Windows. The generated moz.build was adjusting the .flags
of this file unconditionally. This worked up until now because the
moz.build was only being evaluated on Windows. However, this assumption
no longer holds true after work in bug 1132771 is complete.

Patch the generation script to put .flags adjustment for the file
in question behind the same conditional as the SOURCES assignment.

--HG--
extra : rebase_source : 77becf0be99b5ade809a90ecf7954345d693d81e

gfx/angle/src/commit.h

@@ -1,3 +1,3 @@
-#define ANGLE_COMMIT_HASH "180bf375fb42"
+#define ANGLE_COMMIT_HASH "040a674b6d67"
 #define ANGLE_COMMIT_HASH_SIZE 12
-#define ANGLE_COMMIT_DATE "2015-02-05 14:21:03 -0500"
+#define ANGLE_COMMIT_DATE "2015-02-18 11:50:36 -0500"

gfx/angle/src/libGLESv2/moz.build

@@ -234,5 +234,6 @@ DEFFILE = SRCDIR + '/libGLESv2.def'
 
 SOURCES['renderer/d3d/HLSLCompiler.cpp'].flags += ['-DANGLE_PRELOADED_D3DCOMPILER_MODULE_NAMES=\'{ TEXT("d3dcompiler_47.dll"), TEXT("d3dcompiler_46.dll"), TEXT("d3dcompiler_43.dll") }\'']
 
-SOURCES['renderer/d3d/d3d11/SwapChain11.cpp'].flags += ['-DANGLE_RESOURCE_SHARE_TYPE=D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX']
+if CONFIG['MOZ_HAS_WINSDK_WITH_D3D']:
+    SOURCES['renderer/d3d/d3d11/SwapChain11.cpp'].flags += ['-DANGLE_RESOURCE_SHARE_TYPE=D3D11_RESOURCE_MISC_SHARED_KEYEDMUTEX']