Add Tumbler plugins dependencies to CI build

I just realized that half of the Tumbler plugins were not built 😅

Looks good now:

Plugins:
  * GdkPixbuf thumbnailer plugin:                     yes
  * Cover thumbnailer plugin:                         yes
  * FreeType font thumbnailer plugin:                 yes
  * JPEG thumbnailer plugin with EXIF support:        yes
  * Video thumbnailer plugin using ffmpegthumbnailer: yes
  * Video thumbnailer plugin using GStreamer:         yes
  * ODF thumbnailer plugin using libgsf:              yes
  * PDF/PS thumbnailer plugin using poppler:          yes
  * RAW thumbnailer plugin using libopenraw:          yes
  * Freedesktop.org cache plugin:                     yes
  * Loading thumbnailers from .thumbnailer files:     yes
  * EPUB thumbnailer using libgepub:                  yes