Changes

Bump GDB version to 7.10.1
Forward port a bunch of patches.
Improve thread handling on Solaris/Illumos.
Use hash tables for threads rather than linked list.
Ignore Zombie threads to avoid a procfs error similar to:
  procfs: fetch_registers, get_gregs line 3261, /proc/<pid>/lwp/<id>: No such file or directory
Improve GDB resiliency to handle the above error (if at all it happens) and move on rather than getting stuck.
Avoid repeated opening and closing of large number of fds in procfs.c, especially for each single-step.
Move gdb component to developer subdirectory.
Change GDB Makefile to use WS_MAKE_RULES.
 (commit: b3bb6d1)

Update ntfsprogs to 2016.2.22
 (commit: 8c8b805)