Switching of AM_MAINTAINER_MODE in configure.ac, which will result in autoconf/automake not running automatically when making changes to configure.ac / Makefile.am (Faster for most users). Developers need to make sure to run tools/bootstrap.sh before checking in changes to configure.ac / Makefile.am or any m4 files

git-svn-id: https://svn.code.sf.net/p/chan-sccp-b/code/trunk@5004 43c1dc8c-776e-4df2-8ef1-6e829299be21