Use TEXT macro to define ANGLE_PRELOADED_D3DCOMPILER_MODULE_NAMES macro.

This is to make the standalone gyp build work again.
Review URL: https://codereview.appspot.com/7199046

git-svn-id: http://angleproject.googlecode.com/svn/trunk@1724 736b8ea6-26fd-11df-bfd4-992fa37f6226