Try to simplify the initialization of Vload_path
* src/lread.c (load_path_check): New function, split from init_lread. (init_lread): Reorganize. Motivation: If EMACSLOADPATH is set, check/warn about that rather than the defaults, which we are not going to use. Hence we can remove the turn_off_warning and WINDOWSNT || HAVE_NS tests. Don't warn if site-lisp directories are missing. If not installed, start from a blank load-path, since PATH_LOADSEARCH refers to the eventual installation directories.
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