The CMake variable "MSVC" indicates that the Visual Studio compiler is
used but when using that compiler and the "NMake Makefiles JOM" build
generator the *.pdb is wasn't output in a "Debug" directory.
(cherry picked from commit
4e6bceed00b2c64a3cfc0bcbf84350f656a4a7c3)
git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@1834
7f0cb862-5218-0410-a997-
914c9d46530a