Set top level dir in vendor/mklibs to ..

This is required since libcfitsio.a shall be installed in iraf$bin,
not in vendor$bin. The second compliation of cfitsio has hidden that
bug (by installing the second libcfitsio there), since the second
compilation is gone now, this needs to be fixed.

vendor/mklibs

@@ -1,6 +1,6 @@
 #!/bin/csh -f
 
-set p = `pwd`
+set p = `cd ..; pwd`
 set top = $p:h
 
 setenv CC 	"gcc"