cad/camotics: unbreak after the upgrade of lang/v8

After the latest upgrade of v8, C! and CAMotics must be built with c++17
standard.

Obtained from:	https://github.com/CauldronDevelopmentLLC/CAMotics/issues/369
Fixes:		0db7465f14

Reported by:	pkg-fallout

cad/camotics/Makefile

@@ -1,6 +1,7 @@
 PORTNAME=	CAMotics
 DISTVERSIONPREFIX=	v
 DISTVERSION=	1.2.2-rc1
+PORTREVISION=	1
 CATEGORIES=	cad
 
 MAINTAINER=	thierry@FreeBSD.org
@@ -52,7 +53,7 @@ PORTEXAMPLES=	*
 
 MAKE_ARGS+=	cc="${CC}"	\
 		cxx="${CXX}"	\
-		cxxstd="c++14"	\
+		cxxstd="c++17"	\
 		ccflags="${CCFLAGS}"	\
 		cxxflags="${CXXFLAGS} ${QT5_INC}"	\
 		linkflags="${LDFLAGS} ${QT5_LIBS}"	\

cad/camotics/files/patch-src_camotics_contour_TriangleMesh.h

@@ -0,0 +1,11 @@
+--- src/camotics/contour/TriangleMesh.h.orig	2021-07-27 23:51:08 UTC
++++ src/camotics/contour/TriangleMesh.h
+@@ -52,7 +52,7 @@ namespace CAMotics {
+ 
+ 
+     struct VertexSort {
+-      bool operator() (const Vertex *a, const Vertex *b) {return *a < *b;}
++      bool operator() (const Vertex *a, const Vertex *b) const {return *a < *b;}
+     };
+ 
+