Have configure search $PATH for krb5-config

[Darren Tucker]

Hi All.
	Right now, if OpenSSH is configure'ed --with-kerberos5 and the system 
has a krb5-config that's not in /usr/local/bin then configure won't find it.

	The attached patch changes this so krb5-config will be used if it's 
anywhere in the path (although if it exists in the directory specified 
by --with-kerberos5= then the user-supplied path will take precedence). 
  You will need to run autoreconf after applying the patch to rebuild 
configure.

	It seems to work for me (output below, it's a little confusing but it's 
the best I could do without drastically changing the Kerberos tests).  I 
would appreciate any testing on other configurations.

$ ./configure --with-kerberos5
[...]
checking for krb5-config... /usr/bin/krb5-config
checking for /usr/local/bin/krb5-config... /usr/bin/krb5-config

-- 
Darren Tucker (dtucker at zip.com.au)
GPG key 8FF4FA69 / D9A3 86E9 7EEE AF4B B2D4  37C9 C982 80C7 8FF4 FA69
      Good judgement comes with experience. Unfortunately, the experience
usually comes from bad judgement.
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