Const-ify the arguments of str_tolower() and friends to suppress compile

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

Commit: 960af47efdc1670ef90bb1f19e03cd9469bb636b
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2008-07-12T00:44:38Z
Releases: 8.4.0
Const-ify the arguments of str_tolower() and friends to suppress compile
warnings.  Clean up various unneeded cruft that was left behind after
creating those routines.  Introduce some convenience functions str_tolower_z
etc to eliminate tedious and error-prone double arguments in formatting.c.
(Currently there seems no need to export the latter, but maybe reconsider
this later.)

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