Rename config.h to pg_config.h and os.h to pg_config_os.h, fix a number of

places that were including the wrong files.

src/tools/pginclude/pgrminclude

@@ -4,7 +4,7 @@
 trap "rm -f /tmp/$$.c /tmp/$$.o /tmp/$$ /tmp/$$a /tmp/$$b" 0 1 2 3 15
 find . \( -name CVS -a -prune \) -o -type f -print | 
 grep -v '\./postgres.h' |
-grep -v '\./config.h' |
+grep -v '\./pg_config.h' |
 grep -v '\./c.h' |
 while read FILE
 do