Got rid of those int/ptr warnings on AMD64. (The code was

Got rid of those int/ptr warnings on AMD64.  (The code was
casting an {int} to a pointer, and later retrieving the int
by another cast.  It should be safe provided that pointers
are at least as big as {int}, but GCC was giving warnings on
my system, so...fixed.)

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@413 7f0cb862-5218-0410-a997-914c9d46530a