runtime(c): Highlight user defined functions Commit: https://github.com/vim/vim/commit/ca0e9823a1dfd71a17c0f08cb7973d413bf98999 Author: Luca Saccarola <github.e41mv@aleeas.com> Date: Sun Dec 24 18:57:02 2023 +0100 runtime(c): Highlight user defined functions closes: https://github.com/vim/vim/issues/13763 Signed-off-by: Luca Saccarola <github.e41mv@aleeas.com> Signed-off-by: Christian Brabandt <cb@256bit.org>