zlib-rs: properly guard AVX512 tests

the runtime checker returns true if those target features are enabled, so guard
the tests which assert on the runtime check being true accordingly.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>

Author: Fabian-Gruenbichler

zlib-rs/src/adler32/avx2.rs

@@ -145,7 +145,11 @@ unsafe fn helper_32_bytes(mut adler0: u32, mut adler1: u32, src: &[__m256i]) ->
 }
 
 #[cfg(test)]
-#[cfg(target_feature = "avx2")]
+#[cfg(all(
+    target_feature = "avx2",
+    target_feature = "bmi1",
+    target_feature = "bmi2"
+))]
 mod test {
     use super::*;