Win32: use _snwprintf instead of swprintf

swprintf is not the standard function you are looking for

include/vlc_common.h

@@ -77,6 +77,7 @@
  #define PRIx64 "llx"
  #define snprintf __mingw_snprintf
  #define vsnprintf __mingw_vsnprintf
+ #define swprintf _snwprintf
 #endif
 
 /* Function attributes for compiler warnings */