[gdk-pixbuf] Change to more compatible shell location

[Emmanuele Bassi <ebassi src gnome org>]

commit d2098ff6f68c6c0235e0d43ce11f718988685780
Author: Brendan L <nulldomain gmail com>
Date:   Mon Apr 30 17:49:30 2018 -0500

    Change to more compatible shell location
    
    https://bugzilla.gnome.org/show_bug.cgi?id=795705

 build-aux/post-install.sh |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/build-aux/post-install.sh b/build-aux/post-install.sh
index 40aab74..40a47cb 100644
--- a/build-aux/post-install.sh
+++ b/build-aux/post-install.sh
@@ -1,4 +1,4 @@
-#!/usr/bin/bash
+#!/bin/sh
 
 libdir="$1"
 binary_version="$2"