[Base, premake] Cleanup

date has detected _MSVC_LANG for a while, so HAS_UNCAUGHT_EXCEPTIONS isn't needed.

src/xenia/base/chrono.h

@@ -13,8 +13,6 @@
 #include <chrono>
 #include <cstdint>
 
-// https://github.com/HowardHinnant/date/commit/5ba1c1ad8514362dba596f228eb20eb13f63d948#r33275526
-#define HAS_UNCAUGHT_EXCEPTIONS 1
 #include "third_party/date/include/date/tz.h"
 
 #include "xenia/base/clock.h"

third_party/pugixml.lua

@@ -4,7 +4,5 @@ project("pugixml")
   kind("StaticLib")
   language("C++")
   files({
-    "pugixml/src/pugiconfig.hpp",
     "pugixml/src/pugixml.cpp",
-    "pugixml/src/pugixml.hpp",
-  })
+  })