lib/mlib.c: fix error reporting for reading data in do_fd_copy

lib/mlib.c: fix error reporting for reading data in do_fd_copy
optlib/Makefile.am: remove (can't believe this still existed!)
utils/Makefile.in: link md5sum with our own libintl if needed
archtable, scripts/dpkg-architecture.pl: add freebsd-i386
acconfig.h, configure.in, doc/Makefile.in: make building documentation and start-stop-daemon optional
main/help.c: only check for start-stop-daemon in checkpatch() if we build it