debian: Update autopkgtests

This improves the autopkgtest to not use deprecated symbols,
do a runtime test and be more cross build friendly.

See https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=946676
8 jobs for autopkg-tsts in 18 minutes and 57 seconds (queued for 5 minutes and 12 seconds)
Status Name Job ID Coverage
  Build
passed api-visibility #239429
librem5

00:02:49

passed build-debian-clang #239432
librem5

00:04:07

passed build-debian-gcc #239430
librem5

00:03:10

passed build-debian-gcc-static #239431
librem5

00:03:14

passed build-fedora-gcc #239433
librem5

00:03:13

 
  Docs
passed build-gtkdoc #239434
librem5

00:02:24

 
  Test
passed unit-test #239435
librem5

00:02:31

44.5%
 
  Package
passed package-debian #239436
librem5

00:02:51