[premake] Cleanup

src/xenia/base/premake5.lua

@@ -8,8 +8,6 @@ project("xenia-base")
   links({
     "fmt",
   })
-  defines({
-  })
   local_platform_files()
   removefiles({"console_app_main_*.cc"})
   removefiles({"main_init_*.cc"})
@@ -19,4 +17,4 @@ project("xenia-base")
 
 if enableTests then
   include("testing")
-end
+end