staging: Avoid sysroot removal races

Currently a task could remove a dependency needed by another task leading
to build failures, often due to missing dependencies (e.g. dynamic libraries
not being found). This was often seen for all-arch recipes in package_write_rpm.

When removing a dependency, first check that no other task active for the
recipe has that same dependency.

(From OE-Core rev: ff3617cc2cd5618f48a25aa4e3b2014430fcbe23)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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