git-send-email.perl: support no- prefix with older GetOptions

Only Perl version 5.8.0 or later is required, but that comes with
an older Getopt::Long (2.32) that does not support the 'no-'
prefix.  Support for that was added in Getopt::Long version 2.33.

Since the help only mentions the 'no-' prefix and not the 'no'
prefix, add explicit support for the 'no-' prefix to support
older GetOptions versions.

Reported-by: Tom G. Christensen <tgc@statsbiblioteket.dk>
Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
Tested-by: Tom G. Christensen <tgc@statsbiblioteket.dk>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -299,6 +299,7 @@ my $rc = GetOptions("h" => \$help,
 		    "bcc=s" => \@bcclist,
 		    "no-bcc" => \$no_bcc,
 		    "chain-reply-to!" => \$chain_reply_to,
+		    "no-chain-reply-to" => sub {$chain_reply_to = 0},
 		    "smtp-server=s" => \$smtp_server,
 		    "smtp-server-option=s" => \@smtp_server_options,
 		    "smtp-server-port=s" => \$smtp_server_port,
@@ -311,25 +312,34 @@ my $rc = GetOptions("h" => \$help,
 		    "smtp-domain:s" => \$smtp_domain,
 		    "identity=s" => \$identity,
 		    "annotate!" => \$annotate,
+		    "no-annotate" => sub {$annotate = 0},
 		    "compose" => \$compose,
 		    "quiet" => \$quiet,
 		    "cc-cmd=s" => \$cc_cmd,
 		    "suppress-from!" => \$suppress_from,
+		    "no-suppress-from" => sub {$suppress_from = 0},
 		    "suppress-cc=s" => \@suppress_cc,
 		    "signed-off-cc|signed-off-by-cc!" => \$signed_off_by_cc,
+		    "no-signed-off-cc|no-signed-off-by-cc" => sub {$signed_off_by_cc = 0},
 		    "cc-cover|cc-cover!" => \$cover_cc,
+		    "no-cc-cover" => sub {$cover_cc = 0},
 		    "to-cover|to-cover!" => \$cover_to,
+		    "no-to-cover" => sub {$cover_to = 0},
 		    "confirm=s" => \$confirm,
 		    "dry-run" => \$dry_run,
 		    "envelope-sender=s" => \$envelope_sender,
 		    "thread!" => \$thread,
+		    "no-thread" => sub {$thread = 0},
 		    "validate!" => \$validate,
+		    "no-validate" => sub {$validate = 0},
 		    "transfer-encoding=s" => \$target_xfer_encoding,
 		    "format-patch!" => \$format_patch,
+		    "no-format-patch" => sub {$format_patch = 0},
 		    "8bit-encoding=s" => \$auto_8bit_encoding,
 		    "compose-encoding=s" => \$compose_encoding,
 		    "force" => \$force,
 		    "xmailer!" => \$use_xmailer,
+		    "no-xmailer" => sub {$use_xmailer = 0},
 	 );
 
 usage() if $help;

t/t9001-send-email.sh

@@ -392,7 +392,7 @@ test_expect_success $PREREQ 'allow long lines with --no-validate' '
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
 		--smtp-server="$(pwd)/fake.sendmail" \
-		--novalidate \
+		--no-validate \
 		$patches longline.patch \
 		2>errors
 '
@@ -426,7 +426,7 @@ test_expect_success $PREREQ 'In-Reply-To without --chain-reply-to' '
 	git send-email \
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
-		--nochain-reply-to \
+		--no-chain-reply-to \
 		--in-reply-to="$(cat expect)" \
 		--smtp-server="$(pwd)/fake.sendmail" \
 		$patches $patches $patches \
@@ -1067,7 +1067,7 @@ test_expect_success $PREREQ 'in-reply-to but no threading' '
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
 		--in-reply-to="<in-reply-id@example.com>" \
-		--nothread \
+		--no-thread \
 		$patches |
 	grep "In-Reply-To: <in-reply-id@example.com>"
 '
@@ -1077,7 +1077,7 @@ test_expect_success $PREREQ 'no in-reply-to and no threading' '
 		--dry-run \
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
-		--nothread \
+		--no-thread \
 		$patches $patches >stdout &&
 	! grep "In-Reply-To: " stdout
 '
@@ -1088,7 +1088,7 @@ test_expect_success $PREREQ 'threading but no chain-reply-to' '
 		--from="Example <nobody@example.com>" \
 		--to=nobody@example.com \
 		--thread \
-		--nochain-reply-to \
+		--no-chain-reply-to \
 		$patches $patches >stdout &&
 	grep "In-Reply-To: " stdout
 '