build: intergrate fuzz crate into workspace

This makes `fuzz` use the same lockfile
as the rest of the crates
and makes sure it fuzzes the same versions
of dependencies, e.g. `mailparse`.

fuzz/Cargo.toml

@@ -3,28 +3,21 @@ name = "deltachat-fuzz"
 version = "0.0.0"
 publish = false
 edition = "2021"
+license = "MPL-2.0"
 
 [dev-dependencies]
 bolero = "0.8"
 
 [dependencies]
-mailparse = "0.16"
+mailparse = { workspace = true }
 deltachat = { path = ".." }
 format-flowed = { path = "../format-flowed" }
 
-[workspace]
-members = ["."]
-
 [[test]]
 name = "fuzz_dateparse"
 path = "fuzz_targets/fuzz_dateparse.rs"
 harness = false
 
-[[test]]
-name = "fuzz_simplify"
-path = "fuzz_targets/fuzz_simplify.rs"
-harness = false
-
 [[test]]
 name = "fuzz_mailparse"
 path = "fuzz_targets/fuzz_mailparse.rs"