LilyPond devel 2.17.21

Closes #20984.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
jsonpp 1.2.0

Closes #20983.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
audit default template comments
Subversion: fail on --unicode-path
Don't always show an error at the end of brew versions
subversion: remove patch

Closes #20976.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
fix typo