Replace SearchSysCacheGetAttribute with SysCacheGetAttr, which fetches

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

Commit: 27fee810ff9968a1034fea4bba4cd8d078c5d2d1
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2000-01-23T03:43:24Z
Releases: 7.1.1
Replace SearchSysCacheGetAttribute with SysCacheGetAttr, which fetches
an attribute of a tuple previously fetched with SearchSysCacheTuple.
This avoids a lot of redundant cache lookups, particularly in selfuncs.c.
Also, remove SearchSysCacheStruct, which was unused and grotty.

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