Make url-hexify-string accept a list of allowed chars (bug#26469)

* lisp/url/url-util.el (url-hexify-string): Accept a list of allowed
chars.
* doc/misc/url.texi (URI Encoding): Update url-hexify-string doc and
index improvements (bug#24694).
1 job for master in 14 minutes and 38 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Test
failed #3794
test-all

00:14:38

 
Name Stage Failure
failed
test-all Test
Makefile:319: recipe for target 'compile-main' failed
make[2]: Leaving directory '/builds/emacs/emacs/lisp'
make[2]: *** [compile-main] Error 2
Makefile:411: recipe for target 'lisp' failed
make[1]: Leaving directory '/builds/emacs/emacs'
Makefile:1117: recipe for target 'bootstrap' failed
make[1]: *** [lisp] Error 2
make: *** [bootstrap] Error 2
ERROR: Job failed: exit code 1