Switch to using WAPP_PLATFORM_CPP instead of __cplusplus

src/core/os/mem/mem_os.h

@@ -4,9 +4,9 @@
 #include "../../../common/aliases/aliases.h"
 #include "../../../common/platform/platform.h"
 
-#ifdef __cplusplus
+#ifdef WAPP_PLATFORM_CPP
 BEGIN_C_LINKAGE
-#endif // __cplusplus
+#endif // WAPP_PLATFORM_CPP
 
 #include "mem_os_ops.h"
 
@@ -25,8 +25,8 @@ void wapp_mem_util_free(void *ptr, u64 size);
 external void *mem_util_allocate(void *addr, u64 size, MemAccess access, MemAllocFlags flags, MemInitType type);
 external void mem_util_free(void *ptr, u64 size);
 
-#ifdef __cplusplus
+#ifdef WAPP_PLATFORM_CPP
 END_C_LINKAGE
-#endif // __cplusplus
+#endif // WAPP_PLATFORM_CPP
 
 #endif // !MEM_OS_H