Fix integer-overflow and alignment hazards in locale-related code.

Fix integer-overflow and alignment hazards in locale-related code.

pg_locale_icu.c was full of places where a very long input string
could cause integer overflow while calculating a buffer size,
leading to buffer overruns.

It also was cavalier about using char-type local arrays as buffers
holding arrays of UChar.  The alignment of a char[] variable isn't
guaranteed, so that this risked failure on alignment-picky platforms.
The lack of complaints suggests that such platforms are very rare
nowadays; but it's likely that we are paying a performance price on
rather more platforms.  Declare those arrays as UChar[] instead,
keeping their physical size the same.

pg_locale_libc.c's strncoll_libc_win32_utf8() also had the
disease of assuming it could double or quadruple the input
string length without concern for overflow.

Reported-by: Xint Code
Reported-by: Pavel Kohout <pavel.kohout@aisle.com>
Author: Tom Lane <tgl@sss.pgh.pa.us>
Backpatch-through: 14
Security: CVE-2026-6473