swig: add BUILDSWIG macros to disable building of swig modules

Signed-off-by: Brendan Le Foll <brendan.le.foll@intel.com>

src/CMakeLists.txt

@@ -50,10 +50,16 @@ if (DOXYGEN_FOUND)
   endforeach ()
 endif ()
 
-find_package (SWIG)
-if (SWIG_FOUND)
-  include (${SWIG_USE_FILE})
+if (BUILDSWIG)
+  find_package (SWIG)
+  if (SWIG_FOUND)
+    include (${SWIG_USE_FILE})
 
-  add_subdirectory (python)
-  add_subdirectory (javascript)
+    if (BUILDSWIGPYTHON)
+      add_subdirectory (python)
+    endif ()
+    if (BUILDSWIGNODE)
+      add_subdirectory (javascript)
+    endif ()
+  endif ()
 endif ()