Make sure that a 'Version' line is written to the history

file even if VERSION and SVNVERSION are not defined (otherwise
the history.dat file can not be read in).


git-svn-id: svn+ssh://svn.code.sf.net/p/supertuxkart/code/main/trunk@5122 178a84e3-b1eb-0310-8ba1-8eac791a3b58

src/race/history.cpp

@@ -156,6 +156,10 @@ void History::Save()
     int  num_karts = world->getNumKarts();
 #ifdef VERSION
     fprintf(fd, "Version:  %s\n",   VERSION);
+#else ifdef SVNVERSION
+    fprintf(fd, "Version:  %s\n",   SVNVERSION);
+#else
+    fprintf(fd, "Version:  unknown\n",   SVNVERSION);
 #endif
     fprintf(fd, "numkarts: %d\n",   num_karts);
     fprintf(fd, "numplayers: %d\n", race_manager->getNumPlayers());