systemd: fix license according to README file

Fixes:
  http://autobuild.buildroot.org/results/6e3/6e3dace5892a589225a93c896917833ebc8028f3

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/systemd/systemd.mk

@@ -7,8 +7,8 @@
 SYSTEMD_VERSION = 221
 SYSTEMD_SITE = http://www.freedesktop.org/software/systemd
 SYSTEMD_SOURCE = systemd-$(SYSTEMD_VERSION).tar.xz
-SYSTEMD_LICENSE = LGPLv2.1+; GPLv2+ for udev; MIT-like license for few source files listed in README
-SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 LICENSE.MIT
+SYSTEMD_LICENSE = LGPLv2.1+, GPLv2+ (udev), Public Domain (few source files, see README)
+SYSTEMD_LICENSE_FILES = LICENSE.GPL2 LICENSE.LGPL2.1 README
 SYSTEMD_INSTALL_STAGING = YES
 SYSTEMD_DEPENDENCIES = \
 	host-intltool \