* configure: Drop AM_MAINTAINER_MODE
* autogen.sh: Honor NOCONFIGURE=1
* Print which option was in error along with usage message
* Use strcasecmp instead of a tolower loop & strcmp
* autogen.sh: use quoted string variables
* autogen: add default patch prefix
* autogen.sh: use exec instead of waiting for configure to finish
OBS-URL: https://build.opensuse.org/package/show/X11:XOrg/xkill?expand=0&rev=7