Do not hard-code fusermount, add option or auto-detect instead

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The hard-coding is not appropriate. According to libfuse 3.0.0 release
notes: "The fusermount and mount.fuse binaries have been renamed to
fusermount3 and mount.fuse3 to allow co-installation of libfuse 2.x
and 3.x". Some distributions seem to install a symlink, but this is
not upstream's default behavior.

In addition, fusermount might be provided from non-distro sources. So
a build-time option takes precedence over auto-detection logic.

Fixes #5104

Fixes #5694

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