Various bugfixes

* Fixed Nano stamina not being halved on respawn
* Reverted the default argument to terminate() change because MSVC is
undable to disambiguate the function pointer passed to sigaction()
* Fatal errors during init (like in TableData) can just call exit(1)
directly anyway (missing "OpenFusion: terminated." be damned)
* Switched to a slightly more portable syntax for getting the version
in the Makefile
* We shouldn't join the shard thread in the signal handler because the
thread the signal handler ends up running in is undefined behaviour and
we don't strictly need to join it anyway

Many of these issues were discovered on OpenBSD.

src/CNStructs.hpp

@@ -41,7 +41,7 @@ std::string U16toU8(char16_t* src);
 size_t U8toU16(std::string src, char16_t* des, size_t max); // returns number of char16_t that was written at des
 time_t getTime();
 time_t getTimestamp();
-void terminate(int unused=0);
+void terminate(int);
 
 // The PROTOCOL_VERSION definition is defined by the build system.
 #if !defined(PROTOCOL_VERSION)