Fix unquoting of file names in subprocesses (Bug#48177)

Fix unquoting of file names in subprocesses (Bug#48177)

* lisp/files.el (file-name-non-special):
Improve handling of inhibit-file-name-handlers.

* src/callproc.c (Fcall_process, call_process): Unquote infile,
error_file and output_file.  (Bug#48177)

* test/lisp/files-tests.el (files-tests-file-name-non-special--subprocess)
(files-tests-file-name-non-special-file-name-all-completions)
(files-tests-file-name-non-special-file-name-completion): Adapt tests.