flatpak: Update LibRaw to 0.19.2

Even though it uses Autotools, the tarball neither has an autogen.sh
nor a configure script.

!89
3 jobs for wip/rishi/update-libraw-0.19.2 in 14 minutes and 11 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #179187
flatpak

00:12:52

 
  Review
passed #179188
review

00:00:40

passed #179189
allowed to fail manual
stop_review

00:00:39