[Gm2] Success debugging on 64-bit Solaris/Sparc

[John O Goyo]

Recall that I was unable to debug a binary compiled with 64-bit gm2 on
Solaris/Sparc.  After trial, error, and investigation, the reason is
that one needs a 64-bit gdb to debug 64-bit binaries on Solaris/Sparc.

After building such a beast, I was able to debug without problems.

Should anyone else wish to build said beast, please note the following:
1. You must use a 64-bit gcc to compile.
2. Specify --host=sparc64-sun-solaris2 --disable-tui.
  (GDB's configure ignores sparcv9-sun-solaris2, unlike GCC's configure,
   and the latter is to eliminate ncurses dependencies on Unix systems.)

Sincerely,
john