Allow libyaml 0.2 to pass tests, make build on architectures where it failed #11
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The first commit allows libyaml 0.2 to be used in addition to 0.1. This only affects the tests. As far as I can see, the libyaml 0.2 API is compatible to the degree that is used in this crate.
When working on Debian packaging, a small bug showed preventing builds on architectures which use u8 as c_char. https://buildd.debian.org/status/fetch.php?pkg=rust-yaml&arch=arm64&ver=0.3.0-1&stamp=1539200882&raw=0 shows one of the failed builds. This is fixed in the second commit.