RFR: Add path independence

[Athijegannathan Sundararajan]

On Wed, 31 Aug 2022 07:15:33 GMT, Per Minborg <duke at openjdk.org> wrote:

> This small PR incorporated feedback from the original PR: https://github.com/openjdk/jextract/pull/66 made after it was integrated.

I guess we need similar change for many other samples. One flip side of the approach in this PR that we lose the specific version to use. C APIs need not be backward compatible (many are not!). Sample may work on a specific version of C library and not on the latest (or older) brew installed version.

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PR: https://git.openjdk.org/jextract/pull/68