Prior to this update gawk interpreted (under certain circumstances) some
run-time variables as internal zero-length variable prototypes. When gawk tried
to free such run-time variables, it actually freed the internal prototypes, that
were allocated just once due to memory savings. Consequently gawk sometimes
failed and the error message "awk: double free or corruption" was displayed.
With this update the problem has been corrected and the error no longer occurs.