c-api: Remove reexport of wasmtime crate

This is a follow-up to bytecodealliance#6765 to remove this reexport since it was
originally added to use both the C API and the `wasmtime` crate in the
same downstream crate, but this should be possible through Cargo with:

    [dependencies]
    wasmtime = "13"
    wasmtime-c-api = { version = "13", package = "wasmtime-c-api" }

and that way `wasmtime::*` is available as well as `wasmtime_c_api::*`

crates/c-api/src/lib.rs

@@ -11,8 +11,6 @@
 
 #![allow(non_snake_case, non_camel_case_types, non_upper_case_globals)]
 
-pub use wasmtime::*;
-
 mod config;
 mod engine;
 mod error;