Compile on Freebsd (#1044)

* Compile on Freebsd

Small changes needed for compilation on Freebsd. Note that you'll have
to pass -DEQEMU_BUILD_ZLIB=OFF on the cmake command line. The bundled
zlib-ng does not build on Freebsd even though mainline zlib-ng does.

* Fix build errors: typo

zone/main.cpp

@@ -92,6 +92,10 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 #include "../common/unix.h"
 #endif
 
+#ifdef __FreeBSD__
+#include <pthread_np.h>
+#endif
+
 extern volatile bool is_zone_loaded;
 
 EntityList entity_list;
@@ -431,8 +435,10 @@ int main(int argc, char** argv) {
 	EQStreamIdentifier stream_identifier;
 	RegisterAllPatches(stream_identifier);
 
-#ifndef WIN32
+#ifdef __linux__
 	LogDebug("Main thread running with thread id [{}]", pthread_self());
+#elif defined(__FreeBSD__)
+	LogDebug("Main thread running with thread id [{}]", pthread_getthreadid_np());
 #endif
 
 	bool worldwasconnected       = worldserver.Connected();