Do not enable builtin_freetype if fail-on-missing=ON

cmake/modules/SearchInstalledSoftware.cmake

@@ -68,14 +68,20 @@ endif()
 #---Check for Freetype---------------------------------------------------------------
 if(NOT builtin_freetype)
   message(STATUS "Looking for Freetype")
-  find_package(Freetype)
+  if(fail-on-missing)
+    find_package(Freetype REQUIRED)
+  else()
+    find_package(Freetype)
+    if(NOT FREETYPE_FOUND)
+      message(STATUS "FreeType not found. Switching on builtin_freetype option")
+      set(builtin_freetype ON CACHE BOOL "" FORCE)
+    endif()
+  endif()
   if(FREETYPE_FOUND)
     set(FREETYPE_INCLUDE_DIR ${FREETYPE_INCLUDE_DIR_freetype2})
-  else()
-    message(STATUS "FreeType not found. Switching on builtin_freetype option")
-    set(builtin_freetype ON CACHE BOOL "" FORCE)
   endif()
 endif()
+
 if(builtin_freetype)
   set(freetype_version 2.6.1)
   message(STATUS "Building freetype version ${freetype_version} included in ROOT itself")