Minor style normalizations to minimize the diffs between *now* and from

Minor style normalizations to minimize the diffs between *now* and from
before John's changes.  No functional changes:

 * Removed some hard TABs introduced.
 * Removed some spaces-at-end-of-line introduced.
 * A couple of function calls were touched up.

I did this separately only because I don't like messing with other people's
commits.  (I don't like feeling like the style police, either, but when
I mess with the commit, there's no room for reverting my interference if
it is deemed undesirable...)

git-svn-id: svn+ssh://svn.code.sf.net/p/freeglut/code/trunk/freeglut/freeglut@447 7f0cb862-5218-0410-a997-914c9d46530a