Configure: fix the version string in the configure output

Since `$config{version}` and `$config{version_num}` were removed
in commit 3a63dbef15b6, the configure output displays an empty
version number string in parentheses instead of the version number.

This pull request fixes that by adding new config variables
`version` and `full_version`, analogous to `OPENSSL_VERSION_STR`
and `OPENSSL_FULL_VERSION_STR`.

Reviewed-by: Richard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7841)
diff --git a/Configure b/Configure
index 37c9b2a..e2a6025 100755
--- a/Configure
+++ b/Configure
@@ -276,6 +276,9 @@
             || $config{patch} eq "unknown"
             || $config{shlib_version} eq "unknown");
 
+$config{version} = "$config{major}.$config{minor}.$config{patch}";
+$config{full_version} = "$config{version}$config{prerelease}$config{build_metadata}";
+
 # Collect target configurations
 
 my $pattern = catfile(dirname($0), "Configurations", "*.conf");
@@ -999,8 +1002,8 @@
     exit 0;
 }
 
-print "Configuring OpenSSL version $config{version} ($config{version_num}) ";
-print "for $target\n";
+print "Configuring OpenSSL version $config{full_version} ";
+print "for target $target\n";
 
 if (scalar(@seed_sources) == 0) {
     print "Using os-specific seed configuration\n";