fix: use correct property for OS arch checks (#2830)

Author: skylot

jadx-commons/jadx-app-commons/src/main/java/jadx/commons/app/JadxCommonFiles.java

@@ -84,14 +84,15 @@ private synchronized ProjectDirectories loadDirs() {
 		 * Return JNI, Foreign or PowerShell implementation
 		 */
 		private static Windows getWinDirs() {
-			Windows defSup = Windows.getDefaultSupplier().get();
-			if (defSup instanceof WindowsPowerShell) {
+			Windows impl = Windows.getDefaultSupplier().get();
+			if (impl instanceof WindowsPowerShell) {
 				if (JadxSystemInfo.IS_AMD64) {
-					// JNI library compiled for x86-64
-					return new WindowsJni();
+					// JNI library compiled only for x86-64
+					impl = new WindowsJni();
 				}
 			}
-			return defSup;
+			LOG.debug("Using win dirs implementation: {}", impl.getClass().getSimpleName());
+			return impl;
 		}
 
 		public Path getCacheDir() {

jadx-commons/jadx-app-commons/src/main/java/jadx/commons/app/JadxSystemInfo.java

@@ -2,6 +2,7 @@
 
 import java.util.Locale;
 
+@SuppressWarnings("unused")
 public class JadxSystemInfo {
 	public static final String JAVA_VM = System.getProperty("java.vm.name", "?");
 	public static final String JAVA_VER = System.getProperty("java.version", "?");
@@ -16,7 +17,7 @@ public class JadxSystemInfo {
 	public static final boolean IS_LINUX = !IS_WINDOWS && !IS_MAC;
 	public static final boolean IS_UNIX = !IS_WINDOWS;
 
-	private static final String OS_ARCH_LOWER = OS_NAME.toLowerCase(Locale.ENGLISH);
+	private static final String OS_ARCH_LOWER = OS_ARCH.toLowerCase(Locale.ENGLISH);
 	public static final boolean IS_AMD64 = OS_ARCH_LOWER.equals("amd64");
 	public static final boolean IS_ARM64 = OS_ARCH_LOWER.equals("aarch64");