cargo-c will produce a pkg-config file making it easier to statically
link plugins.
Also add 'static' features for plugins depending on < 1.14 as this is the
minimal required version to use static linking because of ABI changes in
core.
There is no way to dynamically ask Cargo to build static or dynamic lib
so we have to build both and pick the one we care when doing the meson
processing.
Fix#88
We don't need JPEG, GIF, etc. support so depending on the whole
dependency chain of them is not needed and only wastes CPU time.
As a result we can remove the gif crate exception in deny.toml.
