git-send-email: Handle quotes when parsing .mailrc files

It is legal and not uncommon to use quotes in a .mailrc file so
you can include a persons fullname as well as their email alias.
Handle this by using quotewords instead of split when parsing
.mailrc files.
Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
Signed-off-by: NJunio C Hamano <gitster@pobox.com>

git-send-email.perl

@@ -409,7 +409,7 @@ sub split_addrs {
 	mailrc => sub { my $fh = shift; while (<$fh>) {
 		if (/^alias\s+(\S+)\s+(.*)$/) {
 			# spaces delimit multiple addresses
-			$aliases{$1} = [ split(/\s+/, $2) ];
+			$aliases{$1} = [ quotewords('\s+', 0, $2) ];
 		}}},
 	pine => sub { my $fh = shift; my $f='\t[^\t]*';
 	        for (my $x = ''; defined($x); $x = $_) {