Don't use standard kerberos library locations in MK1MF builds.

Fix typo in mk1mf.pl
diff --git a/Configure b/Configure
index 1cf439d..ce0e718 100755
--- a/Configure
+++ b/Configure
@@ -995,7 +995,7 @@
 			if $withargs{"krb5-dir"} eq "";
 		$withargs{"krb5-lib"} = "-L".$withargs{"krb5-dir"}.
 			"/lib -lgssapi -lkrb5 -lcom_err"
-			if $withargs{"krb5-lib"} eq "";
+			if $withargs{"krb5-lib"} eq "" && !$IsMK1MF;
 		$cflags="-DKRB5_HEIMDAL $cflags";
 		}
 	if ($withargs{"krb5-flavor"} =~ /^[Mm][Ii][Tt]/)
@@ -1004,7 +1004,7 @@
 			if $withargs{"krb5-dir"} eq "";
 		$withargs{"krb5-lib"} = "-L".$withargs{"krb5-dir"}.
 			"/lib -lgssapi_krb5 -lkrb5 -lcom_err -lk5crypto"
-			if $withargs{"krb5-lib"} eq "";
+			if $withargs{"krb5-lib"} eq "" && !$IsMK1MF;
 		$cflags="-DKRB5_MIT $cflags";
 		$withargs{"krb5-flavor"} =~ s/^[Mm][Ii][Tt][._-]*//;
 		if ($withargs{"krb5-flavor"} =~ /^1[._-]*[01]/)