EGL is always double-buffered

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1688 7f0cb862-5218-0410-a997-914c9d46530a
Update GLES instructions

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1689 7f0cb862-5218-0410-a997-914c9d46530a
Rewrite EGL attributes using our ATTRIB/ATTRIB_VAL macros

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1690 7f0cb862-5218-0410-a997-914c9d46530a
Clarify the problem with Raspberry PI

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1691 7f0cb862-5218-0410-a997-914c9d46530a
Provide Android binaries for testers

git-svn-id: https://svn.code.sf.net/p/freeglut/code/trunk@1692 7f0cb862-5218-0410-a997-914c9d46530a
Merge remote-tracking branch 'svn/trunk' into git_master