Eliminate even more warnings and bump warning level to 3

Shouldn't need to go any higher, level 4+ gives insane warnings

src/common/typedef.h

@@ -1,3 +1,8 @@
+#ifndef HEXCHAT_TYPEDEF_H
+#define HEXCHAT_TYPEDEF_H
+
+#ifdef WIN32
+
 #ifndef SSIZE_T_DEFINED
 #ifdef ssize_t
 #undef ssize_t
@@ -9,3 +14,12 @@ typedef _W64 int         ssize_t;
 #endif
 #define SSIZE_T_DEFINED
 #endif
+
+#ifndef fstat
+#define fstat _fstat
+#define stat _stat
+#endif
+
+#endif
+
+#endif