Restrict brotli usage to devices with more than 2 physical cores

For us it doesn't really matter amount of cores available for us.
We need only physical cores count as we use it for filtering weak
devices.

_SC_NPROCESSORS_CONF - amount of physical cores (android devices
doesn't have extrnal cpu cores hotplug). **Used**

_SC_NPROCESSORS_ONLN - amount of cores available for OS right now.
Often smaller than _SC_NPROCESSORS_CONF because OS can deactivate cores
for powersave

Runtime.getRuntime().availableProcessors() - a core count available to
jvm. Has the same limitations as _SC_NPROCESSORS_ONLN but also can be
decreased because some cores are allocated to other more priority
processes (?)

Author: Yevhen Babiichuk (DustDFG)

app/src/main/java/org/schabi/newpipe/DownloaderImpl.java

@@ -1,6 +1,8 @@
 package org.schabi.newpipe;
 
 import android.content.Context;
+import android.system.Os;
+import android.system.OsConstants;
 
 import androidx.annotation.NonNull;
 import androidx.annotation.Nullable;
@@ -43,13 +45,20 @@ public final class DownloaderImpl extends Downloader {
     private final OkHttpClient client;
 
     private DownloaderImpl(final OkHttpClient.Builder builder) {
+        final CompressionInterceptor compressionInterceptor;
+        if (Os.sysconf(OsConstants._SC_NPROCESSORS_CONF) > 2) {
+            compressionInterceptor = new CompressionInterceptor(
+                    Brotli.INSTANCE,
+                    Gzip.INSTANCE);
+        } else {
+            compressionInterceptor = new CompressionInterceptor(
+                    Gzip.INSTANCE);
+        }
         this.client = builder
                 .readTimeout(30, TimeUnit.SECONDS)
 //                .cache(new Cache(new File(context.getExternalCacheDir(), "okhttp"),
 //                        16 * 1024 * 1024))
-                .addInterceptor(new CompressionInterceptor(
-                        Brotli.INSTANCE,
-                        Gzip.INSTANCE))
+                .addInterceptor(compressionInterceptor)
                 .build();
         this.mCookies = new HashMap<>();
     }