cad/librepcb: add support of OpenCascade

Patch from upstream, slightly modified because cad/opencascade has been
fixed against the reported crash.

PR:		277312
Approved by:	yuri (maintainer)

cad/librepcb/Makefile

@@ -1,6 +1,7 @@
 PORTNAME=	librepcb
 DISTVERSION=	1.0.0
 DISTVERSIONSUFFIX=	-source
+PORTREVISION=	1
 CATEGORIES=	cad
 MASTER_SITES=	https://download.librepcb.org/releases/${DISTVERSION}/
 

cad/librepcb/files/patch-cmake_FindOpenCascade.cmake

@@ -0,0 +1,39 @@
+--- cmake/FindOpenCascade.cmake.orig	2023-09-24 10:47:05 UTC
++++ cmake/FindOpenCascade.cmake
+@@ -1,6 +1,3 @@
+-# Specify OpenCascade libraries needed for LibrePCB
+-set(OCC_LIBRARIES TKXCAF TKXDESTEP)
+-
+ # Add library
+ add_library(open_cascade INTERFACE)
+ add_library(OpenCascade::OpenCascade ALIAS open_cascade)
+@@ -15,8 +12,16 @@ if(OpenCASCADE_FOUND)
+ # Try to find OCCT shared library on the system
+ find_package(OpenCASCADE CONFIG QUIET)
+ if(OpenCASCADE_FOUND)
+-  message(STATUS "Using system OpenCASCADE (OCCT)")
++  message(STATUS "Using system OpenCASCADE (OCCT ${OpenCASCADE_VERSION})")
+
++  # Specify OpenCascade libraries needed for LibrePCB
++  # https://github.com/LibrePCB/LibrePCB/issues/1315
++  if(OpenCASCADE_VERSION VERSION_GREATER_EQUAL 7.8.0)
++    set(OCC_LIBRARIES TKCAF TKDESTEP)
++  else()
++    set(OCC_LIBRARIES TKXCAF TKXDESTEP)
++  endif()
++
+   # Populate target
+   target_include_directories(
+     open_cascade SYSTEM INTERFACE "${OpenCASCADE_INCLUDE_DIR}"
+@@ -32,7 +37,10 @@ if(OCE_FOUND)
+ # Try to find OCE shared library on the system
+ find_package(OCE CONFIG QUIET)
+ if(OCE_FOUND)
+-  message(STATUS "Using system OpenCASCADE (OCE)")
++  message(STATUS "Using system OpenCASCADE (OCE ${OCE_VERSION})")
++
++  # Specify OpenCascade libraries needed for LibrePCB
++  set(OCC_LIBRARIES TKXCAF TKXDESTEP)
+
+   # Populate target
+   target_include_directories(