[csmith-project/creduce] adc2db: Add `cppp' to the Automake-based build.

[Eric Eide <eeide@cs.utah.edu>]

  Branch: refs/heads/cppp
  Home:   https://github.com/csmith-project/creduce
  Commit: adc2db7ef31a16926f94dcb0a928b5533cefb97a
      https://github.com/csmith-project/creduce/commit/adc2db7ef31a16926f94dcb0a928b5533cefb97a
  Author: Eric Eide <eeide@cs.utah.edu>
  Date:   2015-10-29 (Thu, 29 Oct 2015)

  Changed paths:
    M Makefile.am
    M Makefile.in
    M configure
    M configure.ac
    A third_party/Makefile.am
    A third_party/Makefile.in
    A third_party/cppp/Makefile.am
    A third_party/cppp/Makefile.in

  Log Message:
  -----------
  Add `cppp' to the Automake-based build.

`cppp' is now compiled and installed in C-Reduce's libexec directory,
alongside its other internal tools.

This initial version of the `cppp' Makefile doesn't deal with the Win32
version of its "unixisms" file.  Future work.

This commit does *not* include changes to the CMake-based build process.
Contributions from CMake users would be welcome.