* configure.in: Call AC_CONFIG_HEADER with config.h:config.in.
Change CONFIG_HEADERS test in AC_OUTPUT accordingly.
* configure: Rebuild.
* Makefile.in (stamp-h): Depend upon config.in, not config.h.in.
Set CONFIG_HEADERS to config.h:config.in.
The file name config.h.in can be used on DOS filesystems.