Dedicated search path variable for architecture-dependant loadable file

[Zhu Zihao <all_but_last@163.com>]

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Hi, Emacs hackers!

Recently I'm working with a Emacs project that contains a dynamic module
written in Rust.

In order to use "require" to load the dynamic module in Lisp file. I
have to ensure the compiled library in the "load-path" variable. Usually
it was placed under the same directory of other Lisp files.

It's OK for me. But it's not an idiomatic way in distribution packaging.
For distrbution packaged Elisp packages, Lisp files usually placed at
<prefix>/share/emacs/site-lisp. In FHS spec
(https://www.pathname.com/fhs/pub/fhs-2.3.html), <prefix>/share should
only contains architecture-independant files, and obviously dynamic
library is not the case. They should be placed under <prefix>/lib.

My suggestion is add a new `native-load-path` Lisp variable and
`EMACSNATIVELOADPATH` environment variable to enable a dedicated search
path for native files.

Looking for your comments :)
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Zihao

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