Fix 'expand-file-name' during startup on MS-Windows
* src/w32.c (w32_init_file_name_codepage): New function, resets file_name_codepage and w32_ansi_code_page to undo the values recorded during dumping. (codepage_for_filenames): Fix an embarrassing typo. Ignore the cached value of file-name encoding if it is nil, i.e. not initialized yet. Actually cache the last used file-name encoding to avoid calling APIs when not necessary. * src/w32.h (w32_init_file_name_codepage): Add prototype. * src/w32term.c (syms_of_w32term): Set the value of w32_unicode_filenames according to the OS version. This avoids resetting it during startup, which then causes temacs to run with the incorrect value. * src/emacs.c (main): Call w32_init_file_name_codepage early during the startup. * src/fileio.c (Fexpand_file_name) [WINDOWSNT]: Update 'newdir' after converting $HOME to a UTF-8 string, so that 'newdirlim' is consistent with it. (Bug#25038) * lisp/international/mule-cmds.el (set-locale-environment): Set 'default-file-name-coding-system' to the ANSI codepage even in non-interactive sessions. * lisp/files.el (directory-abbrev-alist, abbreviated-home-dir): Doc fix. (abbreviate-file-name): Decode 'abbreviated-home-dir' if it is a unibyte string. * doc/lispref/files.texi (Directory Names): Index 'directory-abbrev-alist'.
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