Fixed inclusion of a header file that isn't actually finished.

libs/spandsp/src/spandsp/expose.h

@@ -76,7 +76,7 @@
 #include <spandsp/private/v42.h>
 #include <spandsp/private/v42bis.h>
 #include <spandsp/private/at_interpreter.h>
-#include <spandsp/private/data_modems.h>
+//#include <spandsp/private/data_modems.h>
 #include <spandsp/private/fax_modems.h>
 #include <spandsp/private/timezone.h>
 #include <spandsp/private/image_translate.h>