`-nan + 0 = +nan` on riscv64

Tag missing for 20250804?

Updated rand() implementation seems incorrect

awk needlessly dies when a variable is assigned with embedded newline

use CC instead HOSTCC for maketab

Field operator does not accept a regex

Constants aren't

awk prints a wrong line number in the error message

awk doesn't convert strings to zero for $0

getline < directory returns zero