gnucash-on-windows master: Get jhbuild from gitlab.gnome.org

[John Ralls]

Updated	 via  https://github.com/Gnucash/gnucash-on-windows/commit/5efdb8b1 (commit)
	from  https://github.com/Gnucash/gnucash-on-windows/commit/2785a680 (commit)



commit 5efdb8b126b9f4207c2972f662d27d5a66841646
Author: John Ralls <jralls at ceridwen.us>
Date:   Tue May 26 10:20:49 2020 -0700

    Get jhbuild from gitlab.gnome.org
    
    MinGW-w64 dropped the packaged jhbuild, so rewire setup_mingw64 to
    clone the gnome repository, patch it to disable DESTDIR, and make
    a command file.
    
    Also don't patch FindSWIG.cmake when it's already been patched.



Summary of changes:
 jhbuild.in            | 23 +++++++++++++++++++++++
 patches/jhbuild.patch | 41 ++++++++++++++++++++++-------------------
 setup-mingw64.ps1     | 24 +++++++++++++++++++-----
 3 files changed, 64 insertions(+), 24 deletions(-)
 create mode 100644 jhbuild.in