[Android] -j, not ndk.jobs, in Gradle

android/android_studio_project/app/build.gradle

@@ -18,13 +18,14 @@ android {
                 arguments 'NDK_APPLICATION_MK:=../../../build/xenia.Application.mk',
                         'PREMAKE_ANDROIDNDK_PLATFORMS:=Android-ARM64',
                         'PREMAKE_ANDROIDNDK_PLATFORMS+=Android-x86_64',
+                        // ndk.jobs doesn't work as of Gradle 7.1.0.
+                        "-j${Runtime.runtime.availableProcessors()}",
                         // Work around "Bad file descriptor" on Windows on NDK r22+.
                         '--output-sync=none'
             }
         }
         ndk {
             abiFilters 'arm64-v8a', 'x86_64'
-            jobs Runtime.runtime.availableProcessors()
             stl 'c++_static'
         }
     }