Move wchar2char() and char2wchar() from tsearch into /mb to be easier to

Bruce Momjian <bruce@momjian.us>

Commit: 9de09c087d63b13b54a0db1073477d70188823c5
Author: Bruce Momjian <bruce@momjian.us>
Date: 2008-06-18T18:42:54Z
Releases: 8.4.0
Move wchar2char() and char2wchar() from tsearch into /mb to be easier to
use for other modules;  also move pnstrdup().

Clean up code slightly.

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