When this dependency is missing, it fails to build.  Noticed in the most
recent aarch64 bulk build.

OK for 7.9?

Index: cad/openscad/Makefile
===================================================================
RCS file: /cvs/openbsd/ports/cad/openscad/Makefile,v
diff -u -p -u -p -r1.60 Makefile
--- cad/openscad/Makefile	6 Apr 2026 02:28:34 -0000	1.60
+++ cad/openscad/Makefile	23 Apr 2026 05:57:14 -0000
@@ -2,7 +2,7 @@ COMMENT =		programmers solid 3D CAD mode
 
 V =			2026.02.24
 DISTNAME =		openscad-${V}
-REVISION =		0
+REVISION =		1
 
 CATEGORIES =		cad
 
@@ -36,6 +36,7 @@ WANTLIB += m manifold mpfr opencsg qscin
 COMPILER =		base-clang ports-gcc
 
 BUILD_DEPENDS =		devel/bison \
+			devel/catch2 \
 			devel/gettext,-tools \
 			devel/sanitizers-cmake \
 			graphics/glslang \