Make the to_reg*() functions accept text not cstring.

Using cstring as the input type was a poor decision, because that's not
really a full-fledged type.  In particular, it lacks implicit coercions
from text or varchar, meaning that usages like to_regproc('foo'||'bar')
wouldn't work; basically the only case that did work without explicit
casting was a simple literal constant argument.

The lack of field complaints about this suggests that hardly anyone
is using these functions, so hopefully fixing it won't cause much of
a compatibility problem.  They've only been there since 9.4, anyway.

Petr Korobeinikov

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