Fix vacuum so that autovacuum is really not cancelled when doing an emergency

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: 9c37a4810eee90da9d009dbf31f41ecebcc643f5
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2008-03-14T17:26:01Z
Releases: 8.3.1
Fix vacuum so that autovacuum is really not cancelled when doing an emergency
job (i.e. to prevent Xid wraparound problems.)  Bug reported by ITAGAKI
Takahiro in 20080314103837.63D3.52131E4D@oss.ntt.co.jp, though I didn't use his
patch.

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