Install CGAL as header-only (#4975)

* Update to install CGAL as header-only

I think the issue #2471 would be completely solved, if vcpkg installed CGAL as header-only. That way, the installed `CGALConfig.cmake` would search for its dependencies, instead of hard-coding their path in the file.

* Bump the version

* Fix the cleaning

Once CGAL is header-only, no binary library is created, and the
`debug/` directory got empty.

This commit fixes the cleaning: now the whole `debug/` directory is
removed.

ports/cgal/CONTROL

@@ -1,5 +1,5 @@
 Source: cgal
-Version: 4.13-2
+Version: 4.13-3
 Build-Depends: mpfr, mpir, zlib, boost-format, boost-container, boost-iterator, boost-variant, boost-any, boost-unordered, boost-random, boost-foreach, boost-graph, boost-heap, boost-logic
 Description: The Computational Geometry Algorithms Library (CGAL) is a C++ library that aims to provide easy access to efficient and reliable algorithms in computational geometry.
 

ports/cgal/portfile.cmake

@@ -17,6 +17,7 @@ vcpkg_configure_cmake(
     SOURCE_PATH ${SOURCE_PATH}
     PREFER_NINJA
     OPTIONS
+        -DCGAL_HEADER_ONLY=ON
         -DCGAL_INSTALL_CMAKE_DIR=share/cgal
         -DWITH_CGAL_Qt5=${WITH_CGAL_Qt5}
 )
@@ -28,12 +29,11 @@ vcpkg_fixup_cmake_targets()
 vcpkg_copy_pdbs()
 
 # Clean
-file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/include)
-file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/share)
+file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug)
 if(VCPKG_LIBRARY_LINKAGE STREQUAL "static")
-    file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/bin ${CURRENT_PACKAGES_DIR}/debug/bin)
+    file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/bin)
 else()
-    foreach(ROOT ${CURRENT_PACKAGES_DIR}/bin ${CURRENT_PACKAGES_DIR}/debug/bin)
+    foreach(ROOT ${CURRENT_PACKAGES_DIR}/bin)
         file(REMOVE
             ${ROOT}/cgal_create_CMakeLists
             ${ROOT}/cgal_create_cmake_script