doc: make upload target dependency on rsync optional #76
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Currently, rsync is an unconditional dependency and checked during
meson configure
. As such, the build will fail if rsync is not installedwhich is probably not what was intended here.
From the meson documentation:
This commit fixes the unconditional dependency on rsync with an explicit
find_program invocation with
required: false
. Also wrap thecustom_target in an if statement since it is not allowed to use
non-found external programs in
command
.