Document the need to install MESA-GLES development files

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1619 7f0cb862-5218-0410-a997-914c9d46530a
Fix compilation warning about unused variables and functions

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1620 7f0cb862-5218-0410-a997-914c9d46530a
Fix random crash

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1621 7f0cb862-5218-0410-a997-914c9d46530a
Identify Android thread in the logs

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1622 7f0cb862-5218-0410-a997-914c9d46530a
Make Android work again - adapt to recent changes and fix use of GL-nonES function

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1623 7f0cb862-5218-0410-a997-914c9d46530a
Update SVN instructions

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk/freeglut@1624 7f0cb862-5218-0410-a997-914c9d46530a