[Bug 710984] misc patch to improve MSVC compatibility and CMake build script

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=710984
  GStreamer | gst-plugins-gl | 1.2.0

--- Comment #8 from comicfans44 <comicfans44 at gmail.com> 2013-11-29 00:53:16 UTC ---
plus: I found the compiled dll does not export necessary functions (needs some
additional steps),so it can not be linked to , but the opengl elements in dll
can work with no problem. hopes further improve

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