Look for uuid/uuid.h instead of just uuid.h

Avoids a conflict between /usr/include/uuid.h and
/usr/local/include/uuid/uuid.h on freebsd

src/database/database.cpp

@@ -4,7 +4,7 @@
 #include <database/database.hpp>
 #include <logger/logger.hpp>
 #include <irc/iid.hpp>
-#include <uuid.h>
+#include <uuid/uuid.h>
 #include <utils/get_first_non_empty.hpp>
 #include <utils/time.hpp>