With the advent of elf and mmaping malloc, assumptions that the code made
before about location and contents of the data segment broke. We supplied
an sbrk() only malloc, and recorded the break point at the beginning of
the program, so now save and restore works, in the traditional monop style.
This merges in all such remaining changes from the Linux port of the
NetBSD games, except in hunt (where substantial changes from OpenBSD
need to be looked at).
Some such changes were previously covered in PRs bin/6041, bin/6146,
bin/6148, bin/6150, bin/6151, bin/6580, bin/6660, bin/7993, bin/7994,
bin/8039, bin/8057 and bin/8093.
agc