* m4/readline.m4: Set gnupg_cv_have_readline.
* configure.ac: Add readline support to summary output.
--
Readline is an optional feature which is build if the readline
development files are available on the build systems. Too often they
are missing on a (new) build machine which at least makes debugging
inconvenient.
Backport useful code from fixes for bug 1447.
* configure.ac: Cehck for inet_ntop.
* m4/libcurl.m4: Provide a #define for the version of the curl
library.
--
We do not have keyserver helpers anymore but this fixes may come handy
eventually.
