[Windows] Switch to embedded manifest commands for launcher executables.
https://bugs.webkit.org/show_bug.cgi?id=116109

Reviewed by Darin Adler.

* WinLauncher/WinLauncher.vcxproj/WinLauncher.vcxproj: Remove the
now-unused WinLauncher.exe.manifest file.
* WinLauncher/WinLauncher.vcxproj/WinLauncher.vcxproj.filters: Ditto.
* win/DLLLauncher/DLLLauncherMain.cpp: Add embedded manifest command
when building with VS2010 or newer.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@150080 268f45cc-cd09-0410-ab3c-d52691b4dbfc