Add vita environment (#22)

* vita: initial port

* vita: implement events, enable input thread

* vita: gethostbyname

* vita: Enable audio

* vita: Fix thread crash on discoonect process

* vita: Handle cannot create thread

* vita: now use newlib's socket apis

* vita: Refactoring for moonlight-stream/moonlight-common-c

* Fix review things

https://github.com/moonlight-stream/moonlight-common-c/pull/22#pullrequestreview-2436093

- vita may not support IPv6; so add LC_ASSERT them.
- define inet_ntop to sceNetInetNtop
- guard about failure of sceKernelCreateMutex or sceKernelCreateCond
- remove meanless macros

https://github.com/moonlight-stream/moonlight-common-c/pull/22#pullrequestreview-2444677

- !*mutex to *mutex
- remove useless LC_ASSERT then change to use inet_ntop
  in vita system not defined `sockaddr_in6`, so just use `sockaddr_in` instead this.

https://github.com/moonlight-stream/moonlight-common-c/pull/22#pullrequestreview-2445642

- define sin6_addr

src/VideoStream.c

@@ -243,4 +243,4 @@ int startVideoStream(void* rendererContext, int drFlags) {
     }
 
     return 0;
-}
+}