```
devel/tex-synctex: Update to 1.21.0
Reviewed_by: koobs, ??
Approved by:
Differential_Revision: D32264
```
I didn't increment the dependent ports' PORTREVISION as this change doesn't affect them
to my understandings, except editors/texworks, which required an
update that is carried out in D32265. Please let me know if I had to
do otherwise.