* nlm/aio.h: Protect from multiple inclusions.
* nlm/alpha-io.S: Remove everything we don't need.
* nlm/{alpha-patch.c, alpha-patch.h, alpha-uart.c, alpha-uart.h}:
Remove, no longer needed.
* nlm/alpha.c: Merge in lots of stuff from previous files.
* nlm/alpha.h: Don't #include alpha-patch.h. Make
breakpoint_insn extern.
* Move stuff from alpha-patch.h into here.
* config/alpha/gdbserve.mt (TDEPFILES): Get rid of alpha-uart.o.