mpc: define license

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/mpc/mpc.mk

@@ -6,6 +6,8 @@
 
 MPC_VERSION = 0.9
 MPC_SITE = http://www.multiprecision.org/mpc/download
+MPC_LICENSE = LGPLv2.1+
+MPC_LICENSE_FILES = COPYING.LIB
 MPC_INSTALL_STAGING = YES
 MPC_DEPENDENCIES = gmp mpfr
 MPC_AUTORECONF = YES