openscad: skip (outdated?) boost check

Upstream issue: https://github.com/openscad/openscad/issues/3197

packages/openscad/CMakeLists.txt.patch

@@ -1,6 +1,16 @@
---- ../CMakeLists.txt.orig	2019-10-25 22:29:54.800362557 +0200
-+++ ./CMakeLists.txt	2019-10-25 22:30:48.421653704 +0200
-@@ -688,6 +688,8 @@
+--- ../CMakeLists.txt.orig	2020-02-14 20:41:56.576884809 +0100
++++ ./CMakeLists.txt	2020-02-14 20:44:41.792539280 +0100
+@@ -201,9 +201,6 @@
+   # Check if boost dependency libraries have been found too
+   list(LENGTH BOOST_DIRECTLY_REQUIRED_LIBRARIES BOOST_DIRECTLY_REQUIRED_LIBRARIES_LENGTH)
+   list(LENGTH Boost_LIBRARIES Boost_LIBRARIES_LENGTH)
+-  if(Boost_LIBRARIES_LENGTH EQUAL BOOST_DIRECTLY_REQUIRED_LIBRARIES_LENGTH)
+-    message(FATAL_ERROR "No dependent Boost libraries found. Your CMake (${CMAKE_VERSION}) version might be too old for the version of boost you are using (${Boost_MAJOR_VERSION}.${Boost_MINOR_VERSION}.${Boost_SUBMINOR_VERSION}). In that case, you should have received warnings above of the type: 'Imported targets not available for Boost version ${Boost_VERSION}'")
+-  endif()
+ 
+   find_package(HarfBuzz 0.9.19 REQUIRED QUIET)
+   message(STATUS "Harfbuzz: ${HARFBUZZ_VERSION}")
+@@ -688,6 +685,8 @@
    target_link_libraries(OpenSCAD spnav)
  endif()