Respect mouse-face on SVG image glyphs (bug#67794)

* src/dispextern.h:
* src/image.c (image_spec_value): Export 'image_spec_value'.
* src/xdisp.c (draw_glyphs): Maybe update SVG image glyphs with
mouse face features before drawing.
2 jobs for master in 47 minutes and 51 seconds (queued for 1 minute and 6 seconds)
Status Job ID Name Coverage
  Build Images
failed #78817
build-image-inotify

00:47:51

 
  Normal
skipped #78818
test-src-inotify
 
Name Stage Failure
failed
build-image-inotify Build Images
66df31dc23c5: Retrying in 6 seconds
66df31dc23c5: Retrying in 5 seconds
context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Running after script...
$ test -n "$(docker ps -aq -f name=${test_name})" && docker cp ${test_name}:checkout/test ${test_name}
$ test -n "$(docker ps -aq -f name=${test_name})" && docker rm ${test_name}
$ find ${test_name} ! \( -name "*.log" -o -name ${EMACS_TEST_JUNIT_REPORT} \) -type f -delete
find: build-image-inotify-e69fafdb: No such file or directory
ERROR: Job failed: exit code 1