Unify the naming scheme of all header defines

There have been several renamings of header files but the
ifndef/define/endif preprocessor directives did not always follow
the file name changes (or perhaps never followed a unified naming
scheme). This patch gets all headers aligned with the style of the
majority.

JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu

jerry-core/mem/mem-allocator-internal.h

@@ -1,4 +1,4 @@
-/* Copyright 2014 Samsung Electronics Co., Ltd.
+/* Copyright 2014-2016 Samsung Electronics Co., Ltd.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -30,4 +30,4 @@ extern void mem_run_try_to_give_memory_back_callbacks (mem_try_give_memory_back_
  * @}
  */
 
-#endif /* MEM_ALLOCATOR_INTERNAL_H */
+#endif /* !MEM_ALLOCATOR_INTERNAL_H */