Chirp: Fix FUSE configure flags

[dthain]

Proposed Changes

Fix configure flags so that HAS_FUSE goes in ccflags not ldflags.

Merge Checklist

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• [x] make test Run local tests prior to pushing.
• [x] make format Format source code to comply with lint policies. Note that some lint errors can only be resolved manually (e.g., Python)
• [x] make lint Run lint on source code prior to pushing.
• [x] Manual Update Update the manual to reflect user-visible changes.
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