Revert "Add patch 700_nx-X11_mesa-initialize-server-support-correctly.full.patch. Initialize server_support array with correct size. Fix Mesa upstream bugzilla bug #7353. (Fixes: #776)."

This reverts commit 4db6f0fd.

Reason: the file nx-X11/extras/Mesa/src/glx/x11/glxextensions.c is not
used at build time and has been removed from the code base in NX 3.6.