fix(build): do not show plugin options in musl optimized builds

[LucaGuerra]

Signed-off-by: Luca Guerra [email protected]

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What this PR does / why we need it:

Falco can be built with musl-libc but won't have plugin support in that case. Do not display the relevant option in the command line help. Likewise, do not include plugin directories as they cannot be used.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[jasondellaluce]

This addresses the issue at 👉🏼 #1857 (comment)

[leogr]

/milestone 0.31.0

[leogr]

/approve

[poiana]

LGTM label has been added.

Git tree hash: 14951ee75834beed6a68b242c879a33392a6fd02

[jasondellaluce]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jasondellaluce, leogr, LucaGuerra

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[leogr]

Closing and reopening to trigger our beloved @poiana ❤️

/close

[poiana]

@leogr: Closed this PR.

In response to this:

Closing and reopening to trigger our beloved @poiana ❤️

/close

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[leogr]

/reopen

[poiana]

@leogr: Reopened this PR.

In response to this:

/reopen

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