* gcc.patch: Update for a different GCC (G++) bug.

* gcc.patch:  Update for a different GCC (G++) bug.
* main.c (print_gdb_version):  Update copyright year to 1993.
* nm-hp300bsd.h:  Decide whether this is BSD 4.3 or 4.4,
conditionalize this file on it.  FIXME, right way is to split
these into two config files.
(ATTACH_DETACH):  Define for BSD 4.4
(PTRACE_ARG_TYPE):  caddr_t for BSD 4.4, unset for 4.3.
(U_REGS_OFFSET):  Revise for 4.4.
(REGISTER_U_ADDR):  Separate for 4.4, but it doesn't work yet.
* xm-hp300bsd.h:  Move definitions of UINT_MAX, INT_MAX, INT_MIN,
LONG_MAX into this file to avoid cpp "redefinition" warnings.