get_maintainer: fix perl 5.22/5.24 deprecated/incompatible "\C" use

Perl 5.22 emits a deprecated message when "\C" is used in a regex.  Perl
5.24 will disallow it altogether.

Fix it by using [A-Z] instead of \C.

 [ Upstream commit ce8155f7a3d59ce868ea16d8891edda4d865e873 ]

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Cc: Ian Campbell <ian.campbell@citrix.com>
Cc: Ian Jackson <ian.jackson@eu.citrix.com>
Cc: Jan Beulich <jbeulich@suse.com>
Cc: Keir Fraser <keir@xen.org>
Cc: Tim Deegan <tim@xen.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

scripts/get_maintainer.pl

@@ -277,7 +277,7 @@ open (my $maint, '<', "${xen_path}MAINTAINERS")
 while (<$maint>) {
     my $line = $_;
 
-    if ($line =~ m/^(\C):\s*(.*)/) {
+    if ($line =~ m/^([A-Z]):\s*(.*)/) {
 	my $type = $1;
 	my $value = $2;
 
@@ -512,7 +512,7 @@ sub range_is_maintained {
 
     for (my $i = $start; $i < $end; $i++) {
 	my $line = $typevalue[$i];
-	if ($line =~ m/^(\C):\s*(.*)/) {
+	if ($line =~ m/^([A-Z]):\s*(.*)/) {
 	    my $type = $1;
 	    my $value = $2;
 	    if ($type eq 'S') {
@@ -530,7 +530,7 @@ sub range_has_maintainer {
 
     for (my $i = $start; $i < $end; $i++) {
 	my $line = $typevalue[$i];
-	if ($line =~ m/^(\C):\s*(.*)/) {
+	if ($line =~ m/^([A-Z]):\s*(.*)/) {
 	    my $type = $1;
 	    my $value = $2;
 	    if ($type eq 'M') {
@@ -579,7 +579,7 @@ sub get_maintainers {
 
 	    for ($i = $start; $i < $end; $i++) {
 		my $line = $typevalue[$i];
-		if ($line =~ m/^(\C):\s*(.*)/) {
+		if ($line =~ m/^([A-Z]):\s*(.*)/) {
 		    my $type = $1;
 		    my $value = $2;
 		    if ($type eq 'X') {
@@ -594,7 +594,7 @@ sub get_maintainers {
 	    if (!$exclude) {
 		for ($i = $start; $i < $end; $i++) {
 		    my $line = $typevalue[$i];
-		    if ($line =~ m/^(\C):\s*(.*)/) {
+		    if ($line =~ m/^([A-Z]):\s*(.*)/) {
 			my $type = $1;
 			my $value = $2;
 			if ($type eq 'F') {
@@ -897,7 +897,7 @@ sub find_first_section {
 
     while ($index < @typevalue) {
 	my $tv = $typevalue[$index];
-	if (($tv =~ m/^(\C):\s*(.*)/)) {
+	if (($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index++;
@@ -911,7 +911,7 @@ sub find_starting_index {
 
     while ($index > 0) {
 	my $tv = $typevalue[$index];
-	if (!($tv =~ m/^(\C):\s*(.*)/)) {
+	if (!($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index--;
@@ -925,7 +925,7 @@ sub find_ending_index {
 
     while ($index < @typevalue) {
 	my $tv = $typevalue[$index];
-	if (!($tv =~ m/^(\C):\s*(.*)/)) {
+	if (!($tv =~ m/^([A-Z]):\s*(.*)/)) {
 	    last;
 	}
 	$index++;
@@ -951,7 +951,7 @@ sub get_maintainer_role {
 
     for ($i = $start + 1; $i < $end; $i++) {
 	my $tv = $typevalue[$i];
-	if ($tv =~ m/^(\C):\s*(.*)/) {
+	if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 	    my $ptype = $1;
 	    my $pvalue = $2;
 	    if ($ptype eq "S") {
@@ -1010,7 +1010,7 @@ sub add_categories {
 
     for ($i = $start + 1; $i < $end; $i++) {
 	my $tv = $typevalue[$i];
-	if ($tv =~ m/^(\C):\s*(.*)/) {
+	if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 	    my $ptype = $1;
 	    my $pvalue = $2;
 	    if ($ptype eq "L") {
@@ -1052,7 +1052,7 @@ sub add_categories {
 		if ($name eq "") {
 		    if ($i > 0) {
 			my $tv = $typevalue[$i - 1];
-			if ($tv =~ m/^(\C):\s*(.*)/) {
+			if ($tv =~ m/^([A-Z]):\s*(.*)/) {
 			    if ($1 eq "P") {
 				$name = $2;
 				$pvalue = format_email($name, $address, $email_usename);