send-email: honor transferencoding config option again

Since e67a228 ("send-email: automatically determine
transfer-encoding"), the value of sendmail.transferencoding in the
configuration file is ignored because $target_xfer_encoding is
already defined by the time read_config sub parses the configuration
file.

Instead of initializing variable $target_xfer_encoding to 'auto' on
definition, we have to set it to the default value of 'auto' if it
is undefined after calling read_config() twice to parse the
configuration file for "sendemail.transferencoding" and
"sendemail.$ident.transferencoding".

This is made trivial by the previous change.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

git-send-email.perl

@@ -231,7 +231,7 @@ sub do_edit {
 my (@suppress_cc);
 my ($auto_8bit_encoding);
 my ($compose_encoding);
-my $target_xfer_encoding = 'auto';
+my ($target_xfer_encoding);
 
 my ($debug_net_smtp) = 0;		# Net::SMTP, see send_message()
 
@@ -271,7 +271,7 @@ sub do_edit {
     "from" => [\$sender],
     "assume8bitencoding" => [\$auto_8bit_encoding],
     "composeencoding" => [\$compose_encoding],
-    "transferencoding" => [\$target_xfer_encoding],
+    "transferencoding" => [\$target_xfer_encoding, 'auto'],
 );
 
 my %config_path_settings = (