Add Linux PPC support to the pre-auto-gc example hook

Signed-off-by: Miklos Vajna <vmiklos@frugalware.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

contrib/hooks/pre-auto-gc-battery

@@ -28,6 +28,9 @@ elif grep -q 'on-line' /proc/acpi/ac_adapter/AC/state 2>/dev/null
 then
 	exit 0
 elif grep -q '0x01$' /proc/apm 2>/dev/null
+then
+	exit 0
+elif grep -q "AC Power \+: 1" /proc/pmu/info 2>/dev/null
 then
 	exit 0
 elif test -x /usr/bin/pmset && /usr/bin/pmset -g batt |