Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

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

MFC r268463:

In libproc, avoid calling __cxa_demangle(), and thus depending on either
libcxxrt or libsupc++, if WITHOUT_CXX is defined. [1]

Noticed by: sbruno

[1] However, on stable/10 this is more accurately described by
WITHOUT_GNUCXX, so I've changed the test to that instead.

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

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

Add support for demangling C++ symbols. This requires linking libproc with
libc++rt/libsupc++.

Discussed with: theraven

Revert SHLIB_MAJOR to 2.

As discussed with kan@, since DTrace is the only consumer of libproc
right now, there's no need for a major shlib bump.

Bump the shared library major version due to ABI conflicts.

Sponsored by: The FreeBSD Foundation

New version of libproc. Changes are:
* breakpoint setup support
* register query
* symbol to address mapping and vice-versa
* more misc utility functions based on their Solaris counterpart

Also, I've written some test cases.

Sponsored by: The FreeBSD Foundation

Removed redundant -I. from CFLAGS and "yes" from WITHOUT_MAN.

Build lib/ with WARNS=6 by default.

Similar to libexec/, do the same with lib/. Make WARNS=6 the norm and
lower it when needed.

I'm setting WARNS?=0 for secure/. It seems secure/ includes the
Makefile.inc provided by lib/. I'm not going to touch that directory.
Most of the code there is contributed anyway.

Bump the version of all non-symbol-versioned shared libraries in
preparation for 8.0-RELEASE. Add the previous version of those
libraries to ObsoleteFiles.inc and bump __FreeBSD_Version.

Reviewed by: kib
Approved by: re (rwatson)

Add the Makefile for the process library which was missed in the previous
commit.