gnucash maint: Redo icon handling in cmake

[Geert Janssens]

Updated	 via  https://github.com/Gnucash/gnucash/commit/04bafdeb (commit)
	from  https://github.com/Gnucash/gnucash/commit/ee8729df (commit)



commit 04bafdebf0e7ea9844eac1796d4efe750fdc7e6a
Author: Geert Janssens <geert at kobaltwit.be>
Date:   Sun Apr 3 19:22:56 2022 +0200

    Redo icon handling in cmake
    
    Using globs for file copying prevents cmake from discovering newly added icons.
    Writing rules that explicitly use lists of icons will fix this as a new icon
    in the sources will have to be added to the list and will force reparsing by
    cmake. We have to maintain the lists anyway for our dist target so there's
    actually no extra work involved for the devs.



Summary of changes:
 data/pixmaps/CMakeLists.txt              | 74 +++++++++++++-------------------
 gnucash/gnome/gnc-plugin-page-register.c |  2 +-
 2 files changed, 30 insertions(+), 46 deletions(-)