Remove recipes

recipes/wip/benchmarks/canbench/recipe.toml

-#TODO compiled but not tested
-[source]
-git = "https://github.com/dfinity/canbench"
-[build]
-template = "custom"
-script = """
-cookbook_cargo_packages canbench
-"""

recipes/wip/dev/other/dfx/recipe.toml

-#TODO libloading crate error
-[source]
-git = "https://github.com/dfinity/sdk"
-[build]
-template = "custom"
-script = """
-cookbook_cargo_packages dfx
-"""