S-record download code into srec.c.
* srec.c srec.h: New files. Contain S-record loading routines
formerly in monitor.c.
* serial.c serial.h: New routine just like fprintf, but uses
serial_t instead of FILE *.
* sh-tdep.c (frame_find_saved_regs init_extra_frame_info):
Don't add four to saved pc (makes things match manual). Also, fix
bug where we didn't get pc from stack frame correctly.
* config/sh/tm-sh.h (SAVED_PC_AFTER_CALL): Don't add four to
saved pc. Real hardware does this for you.
* sh3-rom.c (sh3_load): New routine. Sets up for download then
calls generic S-record loader.
* config/h8300/h8300.mt, config/h8500/h8500.mt,
config/m68k/monitor.mt, config/pa/hppapro.mt, config/sh/sh.mt:
Add srec.o to TDEPFILES.
