add expected cfgs to testsuite

Author: adamgreig

testsuite/build.rs

@@ -1,6 +1,13 @@
 fn main() {
     let target = std::env::var("TARGET").unwrap();
 
+    println!("cargo:rustc-check-cfg=cfg(armv6m)");
+    println!("cargo:rustc-check-cfg=cfg(armv7m)");
+    println!("cargo:rustc-check-cfg=cfg(armv7em)");
+    println!("cargo:rustc-check-cfg=cfg(armv8m)");
+    println!("cargo:rustc-check-cfg=cfg(armv8m_base)");
+    println!("cargo:rustc-check-cfg=cfg(armv8m_main)");
+
     if target.starts_with("thumbv6m-") {
         println!("cargo:rustc-cfg=armv6m");
     } else if target.starts_with("thumbv7m-") {