Sync with upstream vhdl mode v3.36.1

Sync with upstream vhdl mode v3.36.1

* lisp/progmodes/vhdl-mode.el (vhdl-version, vhdl-time-stamp): Update.
(vhdl-compiler-alist): Anchor all error regexps.
(vhdl-compile-use-local-error-regexp): Change default to nil.
(vhdl-asort, vhdl-anot-head-p): Remove.
(vhdl-aput, vhdl-adelete, vhdl-aget): Simplify.
Remove optional argument of vhdl-aget and update all callers.
(vhdl-import-project): Also set `vhdl-compiler'.