Properly instruct compound glyphs with compound components

* src/sfnt.c (sfnt_interpret_compound_glyph_2): Don't grow the
compound decomposition context for saving compound points into,
since the space for them already exists.
2 jobs for master in 49 minutes and 13 seconds (queued for 32 seconds)
Status Job ID Name Coverage
  Build Images
failed #78752
build-image-inotify

00:49:13

 
  Normal
skipped #78753
test-src-inotify
 
Name Stage Failure
failed
build-image-inotify Build Images
net/http: request canceled (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-f34f474e: No such file or directory
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1