gitlab-ci: use the included GNU ltdl sources

* .gitlab-ci.yml: Here.
16 jobs for next in 253 minutes and 4 seconds (queued for 1 second)
Status Name Job ID Coverage
  Build
passed alpine-gcc #24652

00:39:53

passed arch-clang #24653

01:00:25

passed arch-gcc-glibcxxdebug #24654

00:57:15

passed debian-gcc-snapshot #24651

01:20:07

passed debian-stable-gcc #24649

00:39:55

passed debian-unstable-gcc-coverage #24650

00:48:08

88.8%
passed debpkg-stable #24657

02:11:35

passed debpkg-unstable #24717

01:59:02

passed mingw-shared #24655

00:33:22

passed mingw-static #24656

00:33:50

passed rpm-pkg #24659

00:54:23

failed debpkg-unstable #24673

02:24:03

passed debpkg-unstable #24672

02:03:07

failed debpkg-unstable #24658

01:59:46

 
  Publish
passed publish-rpm #24660
dput

00:00:17

passed publish-unstable #24661
dput

00:02:05