bsdiff: add license information

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/bsdiff/bsdiff.mk

@@ -7,6 +7,8 @@
 BSDIFF_VERSION = 4.3
 BSDIFF_SITE = http://www.daemonology.net/bsdiff
 BSDIFF_DEPENDENCIES = bzip2
+BSDIFF_LICENSE = BSD-2c
+BSDIFF_LICENSE_FILES = bsdiff.c
 
 define BSDIFF_BUILD_CMDS
 	$(TARGET_CC) $(TARGET_CFLAGS) $(TARGET_LDFLAGS) \