glapi: Mark vertex attrib pointer functions as async.

glapi: Mark vertex attrib pointer functions as async.

These don't actually read data out of the pointers, they set the
pointers (or offsets in a VBO) to be used in a later draw call.

v2: Don't forget glVertexAttribIPointer, and don't bother with annotations
    on aliases.
v3: Mark CompressedTexSubImage1D as sync also.

Acked-by: Timothy Arceri <tarceri@itsqueeze.com>
Acked-by: Marek Olšák <maraeo@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
Tested-by: Mike Lothian <mike@fireburn.co.uk>