fix(cksum): exclude Android from CPU feature detection tests

The test functions test_cpu_features_detection, test_cpu_features_cached, and
test_cpu_features_on_x86_64 call CpuFeatures::detect() which executes the x86
CPUID instruction. On the Android x86_64 emulator, this crashes the adb process
with exit code 137 (SIGKILL).

This fix adds #[cfg(not(target_os = "android"))] attributes to these tests
to prevent them from running on Android, where the CPUID instruction is not
supported by the emulator.

Fixes: Android CI test failure with exit code 137
Resolves: PR uutils#9088 Android x86_64 emulator crash during tests

Author: naoNao89

src/uu/cksum/src/hardware.rs

@@ -118,6 +118,7 @@ mod tests {
     use super::*;
 
     #[test]
+    #[cfg(not(target_os = "android"))]
     fn test_cpu_features_detection() {
         let features = CpuFeatures::detect();
         // Features should be valid booleans - just verify they can be detected
@@ -128,6 +129,7 @@ mod tests {
     }
 
     #[test]
+    #[cfg(not(target_os = "android"))]
     fn test_cpu_features_cached() {
         let features1 = CpuFeatures::detect();
         let features2 = CpuFeatures::detect();
@@ -139,13 +141,11 @@ mod tests {
     }
 
     #[test]
+    #[cfg(all(target_arch = "x86_64", not(target_os = "android")))]
     fn test_cpu_features_on_x86_64() {
-        #[cfg(target_arch = "x86_64")]
-        {
-            let features = CpuFeatures::detect();
-            // On x86_64, at least one feature should be detected or all false
-            // (depending on CPU capabilities)
-            let _ = features;
-        }
+        let features = CpuFeatures::detect();
+        // On x86_64, at least one feature should be detected or all false
+        // (depending on CPU capabilities)
+        let _ = features;
     }
 }