buildPerlPackage: recognize "#!perl" as shebang

pkgs/development/perl-modules/generic/builder.sh

@@ -17,7 +17,7 @@ preConfigure() {
             first=$(dd if="$fn" count=2 bs=1 2> /dev/null)
             if test "$first" = "#!"; then
                 echo "patching $fn..."
-                sed -i "$fn" -e "s|^#\!\(.*[ /]perl.*\)$|#\!\1$perlFlags|"
+                sed -i "$fn" -e "s|^#\!\(.*\bperl\b.*\)$|#\!\1$perlFlags|"
             fi
         fi
     done