Changed util scripts to depend on sh instead of bash

provides better compatibility for embedded linux devices.

util/cairo_include.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 # Make pkg-config lookup include files from the build directory.
 export PKG_CONFIG_PATH=$(cd "$(dirname "$0")"; pwd)/../build_cairo/lib/pkgconfig;

util/has_cairo_freetype.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 has_freetype() {
   pkg-config cairo --cflags-only-I | grep freetype2

util/has_lib.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 has_lib() {
   local regex="lib$1.+(so|dylib)"
 

util/lib_lookup.sh

@@ -1,4 +1,4 @@
-#!/usr/bin/env bash
+#!/usr/bin/env sh
 
 # Make pkg-config lookup include files from the build directory.
 export PKG_CONFIG_PATH=$(cd "$(dirname "$0")"; pwd)/../build_cairo/lib/pkgconfig;