OGL: Fix brace and body placements

Also got rid of void argument specifiers. These are a carryover from C.
OGL: Clean up parameters for some functions.
OGL: Add static to a function in NativeVertexFormat
Merge pull request #790 from lioncash/ogl-cleanup

Small OGL cleanup
JIT: cleanup unnecessary immedate size-checking logic

We do this in the emitter now, so this code isn't needed anymore.