Minor configure.in check

[mouring at etoh.eviladmin.org]

It was brought up that on Solaris 2.7 that 'ar' may not be found when it
steps into openbsd-compat/.  I've not heard of this bug before but this
is the following fix.  Any particle reason for us not to commit this?

- Ben

--- ../openssh/configure.in	Sat Feb  3 17:04:03 2001
+++ configure.in	Mon Feb  5 13:24:41 2001
@@ -8,7 +8,7 @@
 AC_PROG_CPP
 AC_PROG_RANLIB
 AC_PROG_INSTALL
-AC_CHECK_PROG(AR, ar, ar)
+AC_PATH_PROG(AR, ar)
 AC_PATH_PROG(PERL, perl)
 AC_SUBST(PERL)
 AC_PATH_PROG(ENT, ent)