Sync with upstream vhdl mode v3.35.1

Sync with upstream vhdl mode v3.35.1

* lisp/progmodes/vhdl-mode.el (vhdl-version, vhdl-time-stamp): Update.
(vhdl-compiler-alist): Doc fix.
(vhdl-goto-line): Remove.
(vhdl-mode-abbrev-table-init): Add XEmacs compat.
(vhdl-mode) <paragraph-start>: Fix value.
(vhdl-fix-statement-region): Not `for' in wait-statement.
(vhdl-beautify-region): Also (un)tabify.
(vhdl-get-visible-signals):
Scan declarative part of generate statements.
(vhdl-template-record): Fix indentation for record type declaration.
(vhdl-expand-abbrev, vhdl-expand-paren): FIXME.
(vhdl-scan-directory-contents): Tweak.
(vhdl-speedbar-find-file, vhdl-speedbar-port-copy)
(vhdl-compose-components-package):
Replace vhdl-goto-line with forward-line.
(top-level): Tweak speedbar frame selection.
(vhdl-generate-makefile-1): Support for compilers with no
unit-to-file name mapping (create directory with dummy files).