Initial GL ES 1 support.
Caelina is now split among 3 libraries.
- libcaelina.a - context creation and management
- libGL.a - desktop GL API
- libGLESv1.a - GL ES 1 API
Apps must link against libcaelina and one of the two GL libraries.
glFrustumf is now removed from libGL, glFrustum has been added in its place.