hooks--pre-commit: chomp() in cygwin perl does not strip "\r"

[Liu Yubao <yubao.liu@xxxxxxxxx>]

perl v5.8.7 built for cygwin-thread-multi-64int, its chomp() doesn't strip
trailing "\r" so that pre-commit reports "trailing whitespace" for every line.
ActiveState Perl v5.8.8 can strip "\r" and "\n" properly.

Changing
	if (/\s$/) {
to
	if (/[:blank:]$/) {
is also ok.

diff --git a/templates/hooks--pre-commit b/templates/hooks--pre-commit
index 723a9ef..6a55612
--- a/templates/hooks--pre-commit
+++ b/templates/hooks--pre-commit
@@ -54,7 +54,7 @@ perl -e '
        }
        if (s/^\+//) {
            $lineno++;
-           chomp;
+           s/[\r\n]+$//;
            if (/\s$/) {
                bad_line("trailing whitespace", $_);
            }
-
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