configure: warn on invalid ca bundle or path

- Warn if --with-ca-bundle file does not exist.

- Warn if --with-ca-path directory does not contain certificates.

- Improve help messages for both.

Example configure output:

  ca cert bundle:   /some/file   (warning: certs not found)
  ca cert path:     /some/dir   (warning: certs not found)

Bug: https://github.com/curl/curl/issues/404
Reported-by: Jeffrey Walton

1 files changed, 2 insertions, 2 deletions

diff --git a/configure.ac b/configure.ac
index b235cdf9a..b208d4d11 100644
--- a/configure.ac
+++ b/configure.ac
@@ -3891,8 +3891,8 @@ AC_MSG_NOTICE([Configured to build curl/libcurl:
   --libcurl option: ${curl_libcurl_msg}
   Verbose errors:   ${curl_verbose_msg}
   SSPI support:     ${curl_sspi_msg}
-  ca cert bundle:   ${ca}
-  ca cert path:     ${capath}
+  ca cert bundle:   ${ca}${ca_warning}
+  ca cert path:     ${capath}${capath_warning}
   ca fallback:      ${with_ca_fallback}
   LDAP support:     ${curl_ldap_msg}
   LDAPS support:    ${curl_ldaps_msg}