gnucash maint: Add scheme backward compatibility functions renamed in #979

[Christopher Lam]

Updated	 via  https://github.com/Gnucash/gnucash/commit/5957b3c2 (commit)
	from  https://github.com/Gnucash/gnucash/commit/49102c7a (commit)



commit 5957b3c256628e64eeab97d33ea038253e5d9445
Author: Christopher Lam <christopher.lck at gmail.com>
Date:   Fri Apr 23 17:48:12 2021 +0800

    Add scheme backward compatibility functions renamed in #979



Summary of changes:
 bindings/guile/engine.scm               | 10 ++++++++++
 bindings/guile/test/CMakeLists.txt      |  1 +
 bindings/guile/test/test-scm-engine.scm | 20 ++++++++++++++++++++
 3 files changed, 31 insertions(+)
 create mode 100644 bindings/guile/test/test-scm-engine.scm