Add option for the libraries location as part of the vhdl_lang executable #920

Job	Run time
build (vhdl_lang, x86_64-unknown-linux-gnu, stable)	1m 57s
build (vhdl_lang, x86_64-unknown-linux-musl, stable)	2m 4s
This is a release build	0s
build (vhdl_lang, x86_64-pc-windows-msvc, stable)	3m 31s
build (vhdl_lang, aarch64-apple-darwin, stable)	52s
build (vhdl_ls, x86_64-unknown-linux-gnu, stable)	1m 48s
build (vhdl_ls, x86_64-unknown-linux-musl, stable)	1m 56s
build (vhdl_ls, x86_64-pc-windows-msvc, stable)	3m 58s
build (vhdl_ls, aarch64-apple-darwin, stable)	1m 7s
Release	0s
	17m 13s

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