gnucash master: Make swig wrapper generation just another build step

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/980daeec (commit)
	from  https://github.com/Gnucash/gnucash/commit/7cdb79cc (commit)



commit 980daeec83d6fa501aacff4ff8713cbae6755233
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Sat Sep 21 22:50:43 2019 +0200

    Make swig wrapper generation just another build step
    
    Until now it was only done when building from git, but there's no
    real reason not to do it as a normal build step in all cases.
    It may have been unreliable in the past. There's no evidence
    it still is.



Summary of changes:
 CMakeLists.txt                               | 13 +---
 common/CMakeLists.txt                        | 20 ++----
 common/cmake_modules/GncAddSwigCommand.cmake | 95 ++++++++++------------------
 common/cmake_modules/MakeDistFiles.cmake     |  5 +-
 4 files changed, 44 insertions(+), 89 deletions(-)