Add some needed header files

src/tests/dnslib/dnslib_response_tests.c

@@ -17,6 +17,7 @@
 #include "dnslib/rrset.h"
 #include "dnslib/dname.h"
 #include "dnslib/packet.h"
+#include "dnslib/descriptor.h"
 
 /*
  * Resources

src/tests/slab_tests.c

@@ -2,6 +2,7 @@
 #include <unistd.h>
 #include <stdlib.h>
 #include <time.h>
+#include <stdbool.h>
 
 #include "tests/tap_unit.h"
 #include "alloc/slab.h"