Fix several contrib makefiles that failed in VPATH builds, particularly

Tom Lane <tgl@sss.pgh.pa.us>

Commit: c62b29a6034b1cb16abef7012f475fbe6fedc3d5
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2005-10-18T01:30:49Z
Releases: 8.1.0
Fix several contrib makefiles that failed in VPATH builds, particularly
when not using gcc (which has slightly nonstandard inclusion rules).

Files