install-sh from automake does not like -m without delimiting space

install-sh from automake does not like -m without delimiting space

The install-sh script as shipped with automake requires a space between
the -m switch and its argument.  Since this is also the regular way of
doing it with other install implementations this change inserts the
missing space in all makefiles.

Signed-off-by: Robert Schiele <rschiele@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>