Fix CGAL build with major version > 4 on Linux

fixes prusa3d#7341

CGAL upstream CMake config will lock in the major version if installed as a distro package and will not provide any version info if compiled and installed from upstream. As of this commit, PrusaSlicer can be built with CGAL 4.13.2, and 5.0 but there is no universal way to specify the minimum version that would work with static dependencies and linux packages.

sorry prusa3d#4912

src/libslic3r/CMakeLists.txt

@@ -298,7 +298,7 @@ set(CGAL_DO_NOT_WARN_ABOUT_CMAKE_BUILD_TYPE ON CACHE BOOL "" FORCE)
 
 cmake_policy(PUSH)
 cmake_policy(SET CMP0011 NEW)
-find_package(CGAL 4.13 REQUIRED)
+find_package(CGAL REQUIRED)
 cmake_policy(POP)
 
 add_library(libslic3r_cgal STATIC MeshBoolean.cpp MeshBoolean.hpp  TryCatchSignal.hpp