Update build for macos M1 (#77)

jni/android/build.gradle.kts

@@ -27,6 +27,7 @@ android {
 
     externalNativeBuild {
         cmake {
+            version = "3.22.1"
             path("src/main/CMakeLists.txt")
         }
     }

jni/jvm/darwin/build.gradle.kts

@@ -12,8 +12,12 @@ dependencies {
 val copyJni by tasks.creating(Sync::class) {
     onlyIf { org.gradle.internal.os.OperatingSystem.current().isMacOsX }
     dependsOn(":jni:jvm:buildNativeHost")
+    val arch = when (System.getProperty("os.arch")) {
+        "aarch64" -> "aarch64"
+        else -> "x86_64"
+    }
     from(rootDir.resolve("jni/jvm/build/darwin/libsecp256k1-jni.dylib"))
-    into(buildDir.resolve("jniResources/fr/acinq/secp256k1/jni/native/darwin-x86_64"))
+    into(buildDir.resolve("jniResources/fr/acinq/secp256k1/jni/native/darwin-$arch"))
 }
 
 (tasks["processResources"] as ProcessResources).apply {