add libiberty-dev to tools/get-deps.pl
Properly initialize par_mutex

Signed-off-by: Richard Yao <ryao@gentoo.org>
Merge branch 'par_mutex' of https://github.com/ryao/dtrace
     853* .release
          README
          driver/dtrace_asm.c
          driver/dtrace_linux.c
          driver/mutex.c
          driver/prov_common.c
          driver/xen.c
          libdtrace/dt_proc_linux.c
          librtld/rtld_db.c
          linux/rtld_db.h
          tools/get-deps.pl
        dtrace_asm.c: Avoid CLI/STI to avoid issue on Xen kernels.
	   (Ubuntu 12.04).
	Minor changes elsewhere - dt_proc_linux.c is an attempt to
	make the "-c" and pid provider work when we launch a
	process but its not yet finished.