Common: Move header guards over to pragma once

Also replaced C headers with the C++ equivalent ones

src/common/break_points.h

@@ -2,8 +2,7 @@
 // Licensed under GPLv2
 // Refer to the license.txt file included.
 
-#ifndef _DEBUGGER_BREAKPOINTS_H
-#define _DEBUGGER_BREAKPOINTS_H
+#pragma once
 
 #include <vector>
 #include <string>
@@ -98,5 +97,3 @@ public:
 
     void Clear() { m_MemChecks.clear(); };
 };
-
-#endif