global: java access control has important semantic meaning

It's not right to blindly follow all of AndroidStudio's suggestions,
especially for things in tunnel/ which comprise useful API.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

tunnel/src/main/java/com/wireguard/android/util/ModuleLoader.java

@@ -128,7 +128,7 @@ public class ModuleLoader {
     }
 
     @Nullable
-    private static Map<String, Sha256Digest> verifySignedHashes(final String signifyDigest) {
+    private Map<String, Sha256Digest> verifySignedHashes(final String signifyDigest) {
         final byte[] publicKeyBytes = Base64.decode(MODULE_PUBLIC_KEY_BASE64, Base64.DEFAULT);
 
         if (publicKeyBytes == null || publicKeyBytes.length != 32 + 10 || publicKeyBytes[0] != 'E' || publicKeyBytes[1] != 'd')

tunnel/src/main/java/com/wireguard/android/util/RootShell.java

@@ -177,7 +177,7 @@ public class RootShell {
         }
     }
 
-    private void stop() {
+    public void stop() {
         synchronized (lock) {
             if (process != null) {
                 process.destroy();

tunnel/src/main/java/com/wireguard/android/util/ToolsInstaller.java

@@ -107,7 +107,7 @@ public final class ToolsInstaller {
         }
     }
 
-    private boolean extract() throws IOException {
+    public boolean extract() throws IOException {
         localBinaryDir.mkdirs();
         final File[] files = new File[EXECUTABLES.length];
         final File[] tempFiles = new File[EXECUTABLES.length];