do not store 1st two bytes of compressed help text

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

applets/usage_compressed

@@ -24,7 +24,7 @@ echo 'static const char packed_usage[] ALIGN1 = {'
 ## | grep -v '^$' \
 ## | $SED -e 's/\(..\)\(..\)/0x\2,0x\1,/g'
 
-"$loc/usage" | bzip2 -1 | od -v -t x1 \
+"$loc/usage" | bzip2 -1 | dd bs=2 skip=1 | od -v -t x1 \
 | $SED -e 's/^[^ ]*//' \
 | $SED -e 's/ //g' \
 | grep -v '^$' \