Replace use of atol() to set a time_t variable.
(From OE-Core rev: 022866aa0ea6d7a8963d05bb10881e8d97bdf442)
Signed-off-by: Joe Slater <joe.slater@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>