add misc routines from musl

libc/build.mak

libc/misc/a64l.c

libc/misc/basename.c

libc/misc/dirname.c

libc/misc/ffs.c

libc/misc/get_current_dir_name.c

libc/misc/gethostid.c

libc/misc/getopt.c

libc/misc/getopt_long.c

libc/misc/getresgid.c

libc/misc/getresuid.c

libc/misc/getsubopt.c

libc/misc/setdomainname.c