Unexpected diff after autogen.sh

[Nick Rosbrook <rosbrookn@gmail.com>]

Hello,

When writing a patch to tools/configure.ac, re-running autogen.sh
resulted in a diff with unexpected changes. Specifically, these additions:

    diff --git a/configure b/configure
    index 8af54e8a5a..9da3970cef 100755
    --- a/configure
    +++ b/configure
    @@ -644,6 +644,7 @@ infodir
     docdir
     oldincludedir
     includedir
    +runstatedir
     localstatedir
     sharedstatedir
     sysconfdir
    @@ -722,6 +723,7 @@ datadir='${datarootdir}'
     sysconfdir='${prefix}/etc'
     sharedstatedir='${prefix}/com'
     localstatedir='${prefix}/var'
    +runstatedir='${localstatedir}/run'
     includedir='${prefix}/include'
     oldincludedir='/usr/include'
     docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
    @@ -974,6 +976,15 @@ do
       | -silent | --silent | --silen | --sile | --sil)
         silent=yes ;;

    +  -runstatedir | --runstatedir | --runstatedi | --runstated \
    +  | --runstate | --runstat | --runsta | --runst | --runs \
    +  | --run | --ru | --r)
    +    ac_prev=runstatedir ;;
    +  -runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
    +  | --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
    +  | --run=* | --ru=* | --r=*)
    +    runstatedir=$ac_optarg ;;
    +
       -sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
         ac_prev=sbindir ;;
       -sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \

    [...]

...and similar for {docs,tools,stubdom}/configure. These lines were
originally removed in 83c845033d. It seems that the 'runstatedir'
changes in the configure scripts were unintentional and should be added
back.

Thanks,
-NR