Use palloc_array() in pltcl and plperl to avoid overflow

Some of these could overflow on 32-bit systems with the right input.
Convert all cases where we called palloc() with multiplication to fix
them. Not all of them were bugs, but it's better to be safe than
sorry.

Reported-by: Tulya Project, Team Dhiutsa, Bitecope Technologies Private Ltd
Backpatch-through: 14
Security: CVE-2026-14677

Branch
------
REL_19_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/a1c1727cb400b8ae61a13844d7e22ef38e7da79b
Author: Heikki Linnakangas <[email protected]>

Modified Files
--------------
src/pl/plperl/SPI.xs   |  6 +++---
src/pl/plperl/plperl.c | 26 +++++++++++++-------------
src/pl/tcl/pltcl.c     | 16 ++++++++--------
3 files changed, 24 insertions(+), 24 deletions(-)

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