fixup, quick-fix for coolxv/cpp-stub#21

Author: jiridanek

tests/cpp-stub/cpp_stub.h

@@ -124,8 +124,11 @@
 
     //5 byte(jmp rel32)
     #define REPLACE_NEAR(t, fn, fn_stub)\
+        do{\
+        const int addr = fn_stub - fn - CODESIZE_MIN;\
         *fn = 0xE9;\
-        *(int *)(fn + 1) = (int)(fn_stub - fn - CODESIZE_MIN);\
+        memcpy((int *)(fn + 1), &addr, sizeof(int));\
+        }while(false)
         //CACHEFLUSH((char *)fn, CODESIZE);
 #endif