perl-gdtextutil: add license hash

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

package/perl-gdtextutil/perl-gdtextutil.hash

@@ -1,3 +1,6 @@
 # retrieved by scancpan from http://cpan.metacpan.org/
 md5    941ad06eadc86b47f3a32da405665c41 GDTextUtil-0.86.tar.gz
 sha256 886ecbf85cfe94f4135ee5689c4847a9ae783ecb99e6759e12c734f2dd6116bc GDTextUtil-0.86.tar.gz
+
+# computed by scancpan
+sha256 710484e3a1196664bbe8a5ad5d53c528e01226eb20e2885a4e1131eb6c6565cd Dustismo.LICENSE