Merge branch 'gitoxide-port' into 'master'

Add gitoxide recipe

See merge request redox-os/cookbook!277

recipes/gitoxide/recipe.toml

+[source]
+git = "https://github.com/Byron/gitoxide.git"
+
+[build]
+dependencies = [
+    "openssl",
+]
+template = "custom"
+script = """
+export OPENSSL_DIR=${COOKBOOK_ROOT}/recipes/openssl/target/${TARGET}/stage
+export OPENSSL_STATIC="true"
+cookbook_cargo
+"""
+