MFH (r313975, r315909, r317827, r344533): upgrade to latest OpenPAM

Approved by: re (gjb)

Subset of upstream r902 which fixes custom prompts.

PR: 216172

Copy head@r302406 to stable/11 as part of the 11.0-RELEASE cycle.
Prune svn:mergeinfo from the new branch, as nothing has been merged
here.

Additional commits post-branch will follow.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Restore the upstream (and documented) behavior of searching for modules
both in /usr/lib and /usr/local/lib, thus simplifying the use of modules
from ports, without breaking the compat32 case again.

PR: 191151
MFC after: 3 weeks

Upgrade our copy of clang, llvm and lldb to 3.6.0 release.

Please note that from 3.5.0 onwards, clang/llvm/lldb require C++11
support to build; see UPDATING for more information.

Release notes for llvm and clang can be found here:
<http://llvm.org/releases/3.6.0/docs/ReleaseNotes.html>
<http://llvm.org/releases/3.6.0/tools/clang/docs/ReleaseNotes.html>

Thanks to Ed Maste for the lldb part of this upgrade.

Exp-run: antoine

Merge upstream r825: fix line continuation in whitespace

Upgrade to OpenPAM Ourouparia.

Fix incorrect error handling in PAM policy parser. [SA-14:13]

MFV (r262529): fix is_upper() predicate

MFC after: 1 week

MFV (r255387): undo autoprop damage

Approved by: re (glebius)

Update to OpenPAM Nummularia.

MFV (r255364): move the code around in preparation for Nummularia.

Backport upstream r684 (OPENPAM_DEBUG enables debugging macros but does
not turn debugging on by default) and add OPENPAM_DEBUG to CFLAGS.

Merge upstream r634:646: correctly parse mixed quoted / unquoted text.

OpenPAM Micrampelis was re-rolled due to a showstopper bug.

Update to OpenPAM Micrampelis.

r234173 missed one instance of FREE(line).

Noticed by: glebius@

Keep a copy of the original pointer returned by openpam_readline() so
we can free it later, instead of trying to free a pointer that points
to the end of the buffer.

Committed to head because this code no longer exists upstream.

Submitted by: jasone@

Merge upstream r509: don't log an error in the common case (ENOENT).

Upgrade to OpenPAM Lycopsida.

Add minimal validation of the service name to fend off at least one
attack vector against applications that allow the applicant to specify
which policy to apply.

Submitted by: Matthias Drochner <drochner@netbsd.org>
MFC after: 1 week

Don't try to auto-detect dynamic linking; it fails on mips. The Makefile
part of the patch is an ugly (and hopefully temporary) hack.

Discussed with: imp@

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