gnucash master: Fix distcheck.

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5e7dd9d4 (commit)
	from  https://github.com/Gnucash/gnucash/commit/431a525b (commit)



commit 5e7dd9d43aad9eccb5fe6bc8ff6b1171f7ff3da8
Author: John Ralls <jralls at ceridwen.us>
Date:   Thu Sep 24 11:28:07 2015 -0700

    Fix distcheck.
    
    The trick in ff07762 that changing the automake default extension to
    cpp, thus forcing C++ linking even with C sources, while it worked, had
    the side-effect of breaking make-dist because it made automake look for
    *.cpp to put in the tarball and there weren't any such files.
    
    Instead, make the files which use test-engine-stuff.cpp also C++.



Summary of changes:
 src/app-utils/test/Makefile.am                       | 10 +++-------
 .../{test-print-queries.c => test-print-queries.cpp} |  6 ++++--
 ...-scm-query-string.c => test-scm-query-string.cpp} |  6 ++++--
 src/app-utils/test/{test-sx.c => test-sx.cpp}        |  5 ++++-
 src/engine/test-core/test-engine-stuff.cpp           |  8 +++++---
 src/engine/test-core/test-engine-stuff.h             |  5 +++--
 src/engine/test/Makefile.am                          | 13 ++++++++++++-
 ...test-account-object.c => test-account-object.cpp} |  6 ++++--
 .../{test-commodities.c => test-commodities.cpp}     | 20 +++++++++++---------
 src/engine/test/{test-date.c => test-date.cpp}       |  5 +++--
 .../{test-group-vs-book.c => test-group-vs-book.cpp} |  6 ++++--
 src/engine/test/{test-lots.c => test-lots.cpp}       |  6 ++++--
 src/engine/test/{test-numeric.c => test-numeric.cpp} |  4 +++-
 src/engine/test/{test-query.c => test-query.cpp}     |  8 +++++---
 .../test/{test-scm-query.c => test-scm-query.cpp}    |  6 ++++--
 ...-split-vs-account.c => test-split-vs-account.cpp} |  4 +++-
 ...tion-reversal.c => test-transaction-reversal.cpp} | 18 ++++++++++--------
 ...action-voiding.c => test-transaction-voiding.cpp} |  6 ++++--
 18 files changed, 90 insertions(+), 52 deletions(-)
 rename src/app-utils/test/{test-print-queries.c => test-print-queries.cpp} (99%)
 rename src/app-utils/test/{test-scm-query-string.c => test-scm-query-string.cpp} (99%)
 rename src/app-utils/test/{test-sx.c => test-sx.cpp} (98%)
 rename src/engine/test/{test-account-object.c => test-account-object.cpp} (96%)
 rename src/engine/test/{test-commodities.c => test-commodities.cpp} (91%)
 rename src/engine/test/{test-date.c => test-date.cpp} (99%)
 rename src/engine/test/{test-group-vs-book.c => test-group-vs-book.cpp} (98%)
 rename src/engine/test/{test-lots.c => test-lots.cpp} (96%)
 rename src/engine/test/{test-numeric.c => test-numeric.cpp} (99%)
 rename src/engine/test/{test-query.c => test-query.cpp} (95%)
 rename src/engine/test/{test-scm-query.c => test-scm-query.cpp} (98%)
 rename src/engine/test/{test-split-vs-account.c => test-split-vs-account.cpp} (99%)
 rename src/engine/test/{test-transaction-reversal.c => test-transaction-reversal.cpp} (87%)
 rename src/engine/test/{test-transaction-voiding.c => test-transaction-voiding.cpp} (98%)