Give subprocess creation a way to find a valid current directory
for subprocesses when the buffer's default-directory is a handled name. * fileio.c (Funhandled_file_name_directory): New function. (Qunhandled_file_name_directory): New file-name-handler operation. (syms_of_fileio): Defsubr Sunhandled_file_name_directory, and initialize and staticpro Qunhandled_file_name_directory. * callproc.c (Fcall_process): Call Funhandled_file_name_directory on the buffer's default directory. Do it earlier in the function so there's less to GCPRO. * process.c (create_process): Don't check the validity of the buffer's default directory here... (Fstart_process): Instead, do it here; if we call Funhandled_file_name_directory here, there's less GCPROing to do.
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