Generate config.h

This allows us to remove a lot of #ifdef's. Either we want to use
a config.h or we don't. Since we'll want it for e.g. optional gsound
support later on let's have it.

eek/eek-text.c

@@ -23,9 +23,7 @@
  * @short_description: an #EekText represents a text symbol
  */
 
-#ifdef HAVE_CONFIG_H
 #include "config.h"
-#endif  /* HAVE_CONFIG_H */
 
 #include "eek-text.h"
 #include "eek-serializable.h"