Clean up another pre-ANSI-C-ism in regex code: get rid of pcolor typedef.

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

Commit: a859e640035680db31531ccd19a67292dd726baf
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-08-19T17:31:10Z
Releases: 10.0
Clean up another pre-ANSI-C-ism in regex code: get rid of pcolor typedef.

pcolor was used to represent function arguments that are nominally of
type color, but when using a pre-ANSI C compiler would be passed as the
promoted integer type.  We really don't need that anymore.

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