* elf/Makefile (trusted-dirs.st): Use gen-trusted-dirs.awk.
	* elf/gen-trusted-dirs.awk: New file.
	* elf/dl-load.c (systems_dirs): Moved into file scope.  Initialize
	from SYSTEM_DIRS macro.
	(system_dirs_len): New variable.  Contains lengths of system_dirs
	strings.
	(fillin_rpath): Rewrite for systems_dirs being a simple string.
	Improve string comparisons.  Change parameter trusted to be a flag.
	Change all callers.
	(_dt_init_paths): Improve using new format for system_dirs.