perl-module-build: add license file

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

package/perl-module-build/perl-module-build.hash

@@ -1,3 +1,6 @@
 # retrieved by scancpan from http://cpan.metacpan.org/
 md5    b74c2f6e84b60aad3a3defd30b6f0f4d Module-Build-0.4224.tar.gz
 sha256 a6ca15d78244a7b50fdbf27f85c85f4035aa799ce7dd018a0d98b358ef7bc782 Module-Build-0.4224.tar.gz
+
+# computed by scancpan
+sha256 f35ac2cc6b808a38c42c2d230b875217b0a24bb51e5a497ebb630cbb3d806c3e LICENSE