Evas GL common: Improve code readability (simplify macro)

Evas GL common: Improve code readability (simplify macro)

The exact same ugly macro would appear hundreds of times in the GL
code:
  GLERR(__FUNCTION__, __FILE__, __LINE__, "");

Instead, override the common GL functions iif GL_ERRORS is defined.
This greatly simplifies code and removes tons of useless lines.
Also, this will give better debugging output as the exact code line
is printed, and the function name is also printed.

Also, fix linking to the glerr function.

This is a code cleanup. Hopefully I didn't break anything with this
big operation of find & replace.