fix double quote includes

Author: daanx

include/mimalloc-types.h

@@ -10,7 +10,7 @@ terms of the MIT license. A copy of the license can be found in the file
 
 #include <stddef.h>   // ptrdiff_t
 #include <stdint.h>   // uintptr_t, uint16_t, etc
-#include <mimalloc-atomic.h>  // _Atomic
+#include "mimalloc-atomic.h"  // _Atomic
 
 #ifdef _MSC_VER
 #pragma warning(disable:4214) // bitfield is not int