Import globals and export func that uses them

desired.wat

(module
  (type (;0;) (func (param i32)))
  (type (;1;) (func))
  (import "env" "frobinate" (func $frobinate (type 0)))
  (import "env" "glob" (global (;0;) i32))
  (export "foo" (func $foo))
  (func $foo (type 1)
    global.get 0
    call $frobinate
    return))

lib.c

extern int glob;
extern void frobinate(int);

void foo() {
  frobinate(glob);
}

lib.rs

#[link(wasm_import_module = "env")]
extern "C" {
    static glob: u32;
    fn frobinate(num: u32);
}

#[no_mangle]
pub unsafe extern "C" fn foo() {
    frobinate(glob);
}