configure: Also support gtksourceview 4.x.
authorBen Pfaff <blp@cs.stanford.edu>
Mon, 14 Mar 2022 18:51:46 +0000 (11:51 -0700)
committerBen Pfaff <blp@cs.stanford.edu>
Mon, 14 Mar 2022 18:51:46 +0000 (11:51 -0700)
This doesn't require any source code changes because 4.x and 3.x are
source compatible for our purposes.


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