Save states restored video FIFO pointers from unchecked offsets. A
crafted offset could place a pointer outside its backing allocation and
turn the next gather-pipe copy into an out-of-bounds native write.

Require pointer offsets to stay within their backing array and reject a
state when either offset is invalid or the read pointer follows the write
pointer.

- OpenBSD does not have SO_NOSIGPIPE
- Enable some socket related code in AMMediaboard.cpp on OpenBSD

Common: Add Android to GetNetplayDolphinVer

Large anonymous mappings are split into 128 MB chunks. Without MAP_MEM_VM_SHARE,
mach_make_memory_entry_64 will only return an entry spanning the first chunk.
Attempting to map through that entry will fail if it extends beyond the 128 MB
boundary, which can happen when the sizes of MEM1/MEM2 are overridden.

This makes Android players show up as "Android" instead of "Lin".
(This is only visible in DolphinQt, not in the Android GUI.)

I'm also unabbreviating all the existing operating system names:

* Win -> Windows
* Mac -> macOS
* Lin -> Linux

Require VS2026; Update Redist WinUpdater Pulls

Enable Fallthrough warnings