elfutils: disable test suite when cross-compiling

elfutils' test suite uses uname(1) to determine if certain tests can be
executed, e.g. it checks for x86_64 to learn whether it can use
$CC -m64. Obviously, such checks fall flat if we are compiling from e.g.
x86_64 to i686.

Instead of skipping known bad tests, just be safe and disable for
“executable” cross as well.

pkgs/development/tools/misc/elfutils/default.nix

@@ -77,11 +77,17 @@ stdenv.mkDerivation rec {
 
   enableParallelBuilding = true;
 
-  # Backtrace unwinding tests rely on glibc-internal symbol names.
-  # Musl provides slightly different forms and fails.
-  # Let's disable tests there until musl support is fully upstreamed.
-  doCheck = !stdenv.hostPlatform.isMusl;
-  doInstallCheck = !stdenv.hostPlatform.isMusl;
+
+  doCheck =
+    # Backtrace unwinding tests rely on glibc-internal symbol names.
+    # Musl provides slightly different forms and fails.
+    # Let's disable tests there until musl support is fully upstreamed.
+    !stdenv.hostPlatform.isMusl
+    # Test suite tries using `uname` to determine whether certain tests
+    # can be executed, so we need to match build and host platform exactly.
+    && (stdenv.hostPlatform == stdenv.buildPlatform);
+  doInstallCheck = !stdenv.hostPlatform.isMusl
+    && (stdenv.hostPlatform == stdenv.buildPlatform);
 
   passthru.updateScript = gitUpdater {
     url = "https://sourceware.org/git/elfutils.git";