trim: Never trim any glBindTexture calls.

trim: Never trim any glBindTexture calls.

This shouldn't be necessary. I've got a case where trimming out the
glBindTexture of an unused texture changes the behavoir, which
shouldn't be the case.

While I'll still try to track down that bug, this patch provides
conservative behavior that hopefully won't break anything. (The only
real downside is the potential of an implementation getting confused
by a glBindTexture with a value that was not returned by
glGenTextures).