MT#55283 Replace bash shebangs with sh

There are no bash features in these scripts, and some distributions
don't install bash by default.

closes #1685

Change-Id: Ic9cb92ac5975f951f843cbeb3c50293f13f72efc

utils/build_test_wrapper

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 TARGET=$1
 ROOT=$(echo "$TARGET" | sed 's/\.h$//')
 if test "x$MAKE" = x; then

utils/patch-kernel

@@ -1,4 +1,4 @@
-#!/bin/bash
+#!/bin/sh
 
 if test "$1" != magic; then
 	echo