* Makefile.in (SFILES OBS): Add serial.[co] & ser-hardwire.[co].

These implement a new serial line interface for talking to remote
	targets.
	* configure.in:  Link ser-hardwire.c to ser-unix.c for all hosts,
	EXCEPT go32, which gets ser-go32.c.
	* remote.c:  Use new serial interface.  More remote-xxx's to be
	converted later.
	* ser-bsd.c, ser-termios.c:  Removed.
	* serial.c:  New.  Implements common operations for all serial
	types.
	* ser-unix.c:  New.  Unix specific serial operations for various
	flavors of Unix (Posix, SysV, BSD).
	* serial.h:  Generic serial interface defs.
	* config/i386/go32.mh, config/i386/i386bsd.h,
	config/m68k/apollo68b.mh, config/sparc/sun4os4.mh:  Remove
	ser-bsd.o from XDEPFILES.  All the magic is now handled in
	configure.in.

gdb/config/i386/go32.mh

@@ -0,0 +1,3 @@
+MH_CFLAGS=-D__GO32__ -D__MSDOS__
+XDEPFILES= go32-xdep.o
+XM_FILE= xm-go32.h

gdb/config/i386/i386bsd.mh

@@ -1,5 +1,5 @@
 # Host: Intel 386 running 386BSD
-XDEPFILES= ser-bsd.o
+XDEPFILES= 
 NATDEPFILES= exec.o fork-child.o infptrace.o inftarg.o corelow.o coredep.o i386b-nat.o
 XM_FILE= xm-i386bsd.h
 NAT_FILE= nm-i386bsd.h

gdb/config/m68k/apollo68b.mh

@@ -1,6 +1,6 @@
 # Host: Apollo m68k, BSD mode.
 
 XM_FILE= xm-apollo68b.h
-XDEPFILES= ser-bsd.o
+XDEPFILES= 
 NAT_FILE= nm-apollo68b.h
 NATDEPFILES= infptrace.o inftarg.o fork-child.o a68v-nat.o

gdb/config/sparc/sun4os4.mh

@@ -1,5 +1,5 @@
 # Host: Sun 4 or Sparcstation, running SunOS 4
-XDEPFILES= ser-bsd.o
+XDEPFILES= 
 XM_FILE= xm-sun4os4.h
 NAT_FILE= nm-sun4os4.h
 NATDEPFILES= fork-child.o infptrace.o inftarg.o corelow.o sparc-nat.o