Nothing uses inet_ntop()/inet_pton() so remove the CMake define
diff --git a/config.h.in b/config.h.in
index fb697fa..ae9ace0 100644
--- a/config.h.in
+++ b/config.h.in
@@ -2,7 +2,6 @@
 #define PACKAGE_VERSION "@VERSION@"
 
 #cmakedefine HAVE_INET_ATON
-#cmakedefine HAVE_INET_PTON
 #cmakedefine HAVE_GETADDRINFO
 #cmakedefine HAVE_ACTIVE_DESKTOP_H
 #cmakedefine HAVE_ACTIVE_DESKTOP_L