brought back the option to build either as "glut" or "freeglut": FREEGLUT_REPLACE_GLUT


git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1732 7f0cb862-5218-0410-a997-914c9d46530a
Merge remote-tracking branch 'svn/trunk' into git_master