add license to package info.rkt files

related to racket/racket#3760

Author: LiberalArtist

unix-socket-doc/info.rkt

@@ -11,3 +11,6 @@
                      "racket-doc"
                      "web-server-doc"))
 (define pkg-authors '(ryanc))
+
+(define license
+  '(Apache-2.0 OR MIT))

unix-socket-lib/info.rkt

@@ -5,3 +5,6 @@
 (define deps '(("base" #:version "7.9.0.16")
                "net-lib"))
 (define pkg-authors '(ryanc))
+
+(define license
+  '(Apache-2.0 OR MIT))

unix-socket-test/info.rkt

@@ -7,3 +7,6 @@
                      "rackunit-lib"
                      ["unix-socket-lib" #:version "1.3"]))
 (define pkg-authors '(ryanc))
+
+(define license
+  '(Apache-2.0 OR MIT))

unix-socket/info.rkt

@@ -5,3 +5,6 @@
 (define deps '("unix-socket-lib" "unix-socket-doc"))
 (define implies '("unix-socket-lib"))
 (define pkg-authors '(ryanc))
+
+(define license
+  '(Apache-2.0 OR MIT))