Drop gulp-util module and make @types/gulp-util as main module

debian/watch

 version=4
-opts=\
-dversionmangle=auto,\
-filenamemangle=s/.*?(\d[\d\.-]*@ARCHIVE_EXT@)/node-gulp-util-$1/ \
- https://github.com/gulpjs/gulp-util/tags .*/archive/.*/v?([\d\.]+).tar.gz group
-
 # It is not recommended use npmregistry. Please investigate more.
 # Take a look at https://wiki.debian.org/debian/watch/
 opts="searchmode=plain,component=types-gulp-util,ctype=nodejs,pgpmode=none,filenamemangle=s/^.*?(\d[\d\.-]*@ARCHIVE_EXT@)/node-types-gulp-util-$1/" \
- https://registry.npmjs.org/@types/gulp-util https://registry.npmjs.org/@types/gulp-util/-/gulp-util-([\d\.]+)@ARCHIVE_EXT@ checksum
+ https://registry.npmjs.org/@types/gulp-util https://registry.npmjs.org/@types/gulp-util/-/gulp-util-([\d\.]+)@ARCHIVE_EXT@ group
 
 opts=\
 component=gulp-header,\