Fix the MS-DOS build (fallout from 2010-07-12T14:16:38Z!schwab@linux-m68k.org, 2010...

Fix the MS-DOS build (fallout from 2010-07-12T14:16:38Z!schwab@linux-m68k.org, 2010-07-12T17:04:38Z!dann@ics.uci.edu, 2010-07-12T17:21:11Z!dann@ics.uci.edu).

 msdos/sed1v2.inp (C_WARNINGS_SWITCH, PROFILING_CFLAGS, PROFILING_LDFLAGS):
 Edit to empty.
 msdos/sed3v2.inp(C_WARNINGS_SWITCH, PROFILING_CFLAGS, PROFILING_LDFLAGS):
 Edit to empty.
 src/process.c (setup_process_coding_systems): Move to the part
 shared by non-subprocesses systems, and make its body empty when
 subprocesses is not defined.
 (close_process_descs): Move to the part shared by non-subprocesses
 systems.