Getting ready for 2.1. (#1181)

* Getting ready for 2.1.

* Fixed version.

* Year.

* Manually added line as takase said to.

* Fixed minor issue at takase's behest.

* Dunno where that went.

* Updated to use a function pointer.

* OK, as discussed, adding this manually for now.

* Updated SDL.

src/api/process.c

@@ -65,7 +65,7 @@ typedef enum {
 
 #ifdef _WIN32
   static volatile long PipeSerialNumber;
-  static void close_fd(HANDLE* handle) { if (*handle) CloseHandle(*handle); *handle = NULL; }
+  static void close_fd(HANDLE* handle) { if (*handle) CloseHandle(*handle); *handle = INVALID_HANDLE_VALUE; }
 #else
   static void close_fd(int* fd) { if (*fd) close(*fd); *fd = 0; }
 #endif