glsl: remove shebang from python scripts

All of the scripts are [must be] executed via $PYTHON2 [or equivalent]
hence why they are missing the execute bit.

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/compiler/glsl/ir_expression_operation.py

@@ -1,4 +1,3 @@
-#! /usr/bin/env python
 #
 # Copyright (C) 2015 Intel Corporation
 #

src/compiler/glsl/tests/compare_ir.py

@@ -1,4 +1,3 @@
-#!/usr/bin/env python
 # coding=utf-8
 #
 # Copyright © 2011 Intel Corporation