Revert "Add pretty printers for the NPTL lock types"

Revert "Add pretty printers for the NPTL lock types"

This reverts commit 62ce266b0b261def2c6329be9814ffdcc11964d6.

The change is not mature enough because it needs the following fixes:

1. Redirect test output to a file like other tests

2. Eliminate the need to use a .gdbinit because distributions will
   break without it.  I should have caught that but I was in too much
   of a hurry to get the patch in :/

3. Feature checking during configure to determine things like minimum
   required gdb version, python-pexpect version, etc. to make sure
   that tests work correctly.