I broke the build with the preprocessor... oops.

Originally committed to SVN as r1591.

aegisub/version.cpp

@@ -37,7 +37,7 @@
 #include <wx/datetime.h>
 #include "version.h"
 
-#if __WINDOWS__ || __APPLE__
+#if defined(__WINDOWS__) || defined(__APPLE__)
 // This include is generated by build/make-svn-rev-header.py
 // That script should be run before every build is initiated
 #include "build/svn-revision.h"