Fix offsets_static_dynamic_oh_my failure on s390x (#3015)

The test unconditionally emits a SIMD load, which fails on s390x
as we do not yet support SIMD.  Disable this particular part of
the test on s390x.

tests/all/memory.rs

@@ -19,6 +19,7 @@ fn module(engine: &Engine) -> Result<Module> {
             (2, &["i32.load16_s"]),
             (4, &["i32.load" /*, "f32.load"*/]),
             (8, &["i64.load" /*, "f64.load"*/]),
+            #[cfg(not(target_arch = "s390x"))]
             (16, &["v128.load"]),
         ]
         .iter()