glsl/tests: remove any bashisms

Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
Reviewed-by: Andreas Boll <andreas.boll.dev@gmail.com>
Reviewed-by: Eric Engestrom <eric.engestrom@imgtec.com>

src/compiler/glsl/tests/optimization-test.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 if [ ! -z "$srcdir" ]; then
    compare_ir=`pwd`/tests/compare_ir.py
@@ -35,7 +35,7 @@ echo ""
 echo "$pass/$total tests returned correct results"
 echo ""
 
-if [[ $pass == $total ]]; then
+if [ $pass = $total ]; then
     exit 0
 else
     exit 1

src/compiler/glsl/tests/warnings-test.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/bin/sh
 
 # Execute several shaders, and check that the InfoLog outcome is the expected.
 
@@ -24,7 +24,7 @@ echo ""
 echo "$pass/$total tests returned correct results"
 echo ""
 
-if [[ $pass == $total ]]; then
+if [ $pass = $total ]; then
     exit 0
 else
     exit 1