utils/scancpan: improve license file detection

MANIFEST may contains line like this:
"LICENSE                     LICENSE file (added by Distar)"
so, retains only the first word.

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

utils/scancpan

@@ -566,6 +566,7 @@ sub find_license_files {
     my @license_files;
     foreach (split /\n/, $manifest) {
         next if m|/|;
+        s|\s+.*$||;
         push @license_files, $_ if m/(ARTISTIC|COPYING|COPYRIGHT|LICENSE)/i;
     }
     if (scalar @license_files == 0 && $manifest =~ m/(README)[\n\s]/i) {