ota: Merge One True Awk 20250116 bsd-feature 2dce54b053d4

Jan 14, 2025
Fix incorrect error line number issues. unput has
no business managing lineno. Thanks to Ozan Yigit.

Jan 05, 2025
Fix hex detection in is_valid_number.
Fix indirect field specification with non-numeric string
eg. $("foo") in indirect. This is not illegal.
Thanks to Arnold Robbins.

Jan 01, 2025
Fixed openfile to not try to read from a directory.
Thanks to Arnold Robbins.

Sponsored by: Netflix

(cherry picked from commit dd78d987cb38ef162d40aad86229f1dc19884f78)