lib: remove unneeded header includes

These header includes have been flagged by the iwyu_tool
and removed.

Signed-off-by: Sean Morrissey <[email protected]>

examples: skip build when missing dependencies

Trying to disable the vhost library, meson will complain it can't build
the vhost* and vdpa examples when passing -Dexamples=all.

-Dexamples=all skips

examples: skip build when missing dependencies

Trying to disable the vhost library, meson will complain it can't build
the vhost* and vdpa examples when passing -Dexamples=all.

-Dexamples=all skips examples if the example itself announces it can't
be built (for external dependencies, internal dependencies and other
reasons).
Since examples/meson.build will evaluate the internal dependencies
in any case, let's move the check there and resolve the issue for
optional internal libraries.

Fixes: 0bf583222297 ("lib: allow disabling optional libraries")

Signed-off-by: David Marchand <[email protected]>
Acked-by: Bruce Richardson <[email protected]>

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