for manual pages.
* Makefile.am (gprof.info, gprof.1): Depend on config.texi.
(config.texi): New file.
* Makefile.in: Regenerated.
* Makefile.am (configdoc.texi): Set top_srcdir in configdoc.texi..
* Makefile.in: Regenerated.
* ld.texinfo: Include configdoc.texi and ldver.texi in man pages.
Add @file documentation.