* configure.in: Merged content from include/configure.in. Don't configure

* configure.in: Merged content from include/configure.in.  Don't configure
include directory any more; build its makefiles and autoconf.h directly.
Provide comment template when defining C macros.
* include/configure.in: Deleted, content merged into ../configure.in.
* include/Makefile.in (thisconfigdir, mydir): Updated for configure change.
($(srcdir)/krb5/autoconf.stmp): Use $(thisconfigdir) when locating
configure.in and autom4te.cache.
* include/kerberosIV/Makefile.in (thisconfigdir, mydir): Updated for configure
change.
* include/krb5/Makefile.in (thisconfigdir, mydir): Updated for configure
change.

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@17217 dc483132-0cff-0310-8789-dd5450dbe970