tccgen: scopes levels for local symbols (update 1)

Catch top level redeclarations too.

Also fix mistakes in tcctest.c and the tcc sources (win32)
showing up now.

elf.h

@@ -28,13 +28,12 @@ typedef signed char int8_t;
 typedef short int int16_t;
 typedef int int32_t;
 typedef long long int int64_t;
-#endif
-
 typedef unsigned char           uint8_t;
 typedef unsigned short int      uint16_t;
 typedef unsigned int            uint32_t;
 typedef unsigned long long int  uint64_t;
 #endif
+#endif
 
 /* Standard ELF types.  */