Fix cmake search of LLVM and Clang.

In some Linux distrubutions with multiple LLVM/Clang versions
instaled Clad detect wrong (and uncompatioble) versions of
LLVM and Clang.

CMakeLists.txt

@@ -26,6 +26,11 @@ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
     set(LLVM_DIR ${Clang_DIR})
   endif()
 
+  ## Set Cmake packages search order
+
+  set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
+  set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)
+
   ## Find supported LLVM
 
   if (LLVM_FOUND)
@@ -78,9 +83,6 @@ if( CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR )
 
   ## Find supported Clang
 
-  set(CMAKE_FIND_PACKAGE_SORT_ORDER NATURAL)
-  set(CMAKE_FIND_PACKAGE_SORT_DIRECTION DEC)
-
   if (DEFINED CLANG_VERSION)
     if (CLANG_VERSION VERSION_GREATER CLANG_MAX_SUPPORTED)
       set(CLANG_VERSION ${CLANG_MAX_SUPPORTED})