slang: add license info

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/slang/slang.mk

@@ -8,6 +8,8 @@ SLANG_VERSION_MAJOR = 2.2
 SLANG_VERSION = $(SLANG_VERSION_MAJOR).4
 SLANG_SOURCE = slang-$(SLANG_VERSION).tar.bz2
 SLANG_SITE = ftp://ftp.fu-berlin.de/pub/unix/misc/slang/v$(SLANG_VERSION_MAJOR)/
+SLANG_LICENSE = GPLv2+
+SLANG_LICENSE_FILES = COPYING
 SLANG_INSTALL_STAGING = YES
 SLANG_MAKE = $(MAKE1)