src/basic: rename audit.[ch] → audit-util.[ch] and capability.[ch] → capability-util.[ch]

The files are named too generically, so that they might conflict with
the upstream project headers. Hence, let's add a "-util" suffix, to
clarify that this are just our utility headers and not any official
upstream headers.

src/shared/condition.c

@@ -29,7 +29,7 @@
 
 #include "apparmor-util.h"
 #include "architecture.h"
-#include "audit.h"
+#include "audit-util.h"
 #include "cap-list.h"
 #include "condition.h"
 #include "extract-word.h"