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tools/build: Provide fls* when cross-building on Linux

flsll is needed for makefs's new ZFS support, and the others are added
for completeness.

Reviewed by: emaste, arichardson
Fixes: 240afd8c1fcc

tools/build: Provide fls* when cross-building on Linux

flsll is needed for makefs's new ZFS support, and the others are added
for completeness.

Reviewed by: emaste, arichardson
Fixes: 240afd8c1fcc ("makefs: Add ZFS support")
Differential Revision: https://reviews.freebsd.org/D36134

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