Enumerate default UVS glyphs

* src/sfnt.c (sfnt_compare_unicode_value_range)
(sfnt_is_character_default): New functions.
(sfnt_test_uvs): Print and verify the default UVS table.

* src/sfnt.h: Update prototypes.

* src/sfntfont.c (sfntfont_get_variation_glyphs): Index the cmap
with the default glyph, and insert it within VARIATIONS if
character is present within a selector record's default UVS
table.
2 jobs for master in 13 minutes and 26 seconds (queued for 3 minutes and 27 seconds)
Status Job ID Name Coverage
  Build Images
failed #75821
build-image-inotify

00:13:26

 
  Normal
skipped #75822
test-src-inotify
 
Name Stage Failure
failed
build-image-inotify Build Images
Error response from daemon: Get "https://emba.gnu.org:5050/v2/": Get "https://emba.gnu.org//jwt/auth?account=gitlab-ci-token&client_id=docker&offline_token=true&service=container_registry": context deadline exceeded (Client.Timeout exceeded while awaiting headers)
Running after_script
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-6f87ee0e: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1