coxpcall: add license info

Signed-off-by: Francois Perrad <francois.perrad@gadz.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/coxpcall/coxpcall.mk

@@ -7,6 +7,7 @@
 COXPCALL_VERSION = 1.13.0
 COXPCALL_SITE = http://luaforge.net/frs/download.php/3406
 COXPCALL_DEPENDENCIES = lua
+COXPCALL_LICENSE = MIT
 
 define COXPCALL_INSTALL_TARGET_CMDS
 	$(INSTALL) -m 0644 -D $(@D)/src/coxpcall.lua \