Update mksh to R49.

R49 is a recommended bugfix release:

- [tg] dot.mkshrc: fix two issues with the cd wrapper
- [tg] Unbreak set +p (wider issue still to be addressed)
- [Steffen Daode Nurpmeso] Use WCONTINUED with waitpid(2)
- [millert] Add proper suspend builtin handling tty(4) and setpgrp(2)
- [tg] Sanitise and slightly optimise control character handling
- [tg] Add O_BINARY to all open(2) calls for OS/2 kLIBC support
- [tg] Generate option strings for shell, set, ulimit at compile time
- [Steffen Daode Nurpmeso] Drop ISTRIP termios(4) mode
- [tg] Mention negative history numbers, octals in the manpage
- [tg] Make check.pl work with Perl < 5.6.1 again
- [tg] Detect getsid(2) and skip the oksh suspend builtin otherwise
- [tg] Document that set -o noclobber is unsafe for tempfiles
- [tg] Update to Unicode 6.3.0
- [RT] Restore some portability
- [tg] Fix parsing positional argument variable names
- [tg] Sprinkle a few __attribute__((__pure__)); fix warnings
- [tg] Fix build on OSX: always use our wcwidth code; only use our strlcpy(3)
  code if the OE doesn’t provide one (prompted by jonthn on IRC)
- [tg] Optimise sh -c to exec even in MKSH_SMALL
- [tg] Use new BAFH for hashing

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