[cling] Remove hardcoded CLING_OSX_SYSROOT

This is an upstream of https://github.com/conda-forge/root-feedstock/blob/df86316b299d8214d3181d76c31925696f076d5e/recipe/patches/0011-root-x.xx.xx-osx-remove-hardcoded-sysroot.patch

Author: vepadulano

interpreter/cling/lib/Interpreter/CMakeLists.txt

@@ -317,25 +317,6 @@ if (UNIX)
     #define CLING_CXX_INCL \"${CLING_CXX_HEADERS}\"
     #define CLING_INCLUDE_PATHS \"${CLING_INCLUDE_PATHS}\"
   ")
-  if (CMAKE_OSX_SYSROOT)
-    # CMAKE_OSX_SYSROOT hardcodes the concrete version of the sdk
-    # (eg .../MacOSX11.1.sdk) which changes after every update of XCode. We use
-    # the assumption that in the parent folder there is a symlink MacOSX.sdk
-    # which points to the current active sdk. This change allows releases
-    # to work when the users update their sdks.
-    # FIXME: That is a horrible hack and we should teach CIFactory to pick up
-    # the SDK directory at runtime, just as we do for the include paths to C++.
-    set (OSX_SYSROOT_DEFAULT_SDK ${CMAKE_OSX_SYSROOT})
-    if (${OSX_SYSROOT_DEFAULT_SDK} MATCHES "MacOSX[.0-9]+\.sdk")
-      get_filename_component(OSX_SYSROOT_DEFAULT_SDK ${OSX_SYSROOT_DEFAULT_SDK} DIRECTORY)
-      set (OSX_SYSROOT_DEFAULT_SDK ${OSX_SYSROOT_DEFAULT_SDK}/MacOSX.sdk/)
-    endif()
-
-    file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/cling-compiledata.h.in
-      "
-      #define CLING_OSX_SYSROOT \"${OSX_SYSROOT_DEFAULT_SDK}\"
-    ")
-  endif()
   if (CLING_CXX_PATH)
     MESSAGE(STATUS "And if not found, will invoke: '${CLING_CXX_PATH}' for them.")
     file(APPEND ${CMAKE_CURRENT_BINARY_DIR}/cling-compiledata.h.in