android: Add default core count in case ncpus not available
diff --git a/build-android/update_external_sources_android.sh b/build-android/update_external_sources_android.sh
index 53a5880..183ed13 100755
--- a/build-android/update_external_sources_android.sh
+++ b/build-android/update_external_sources_android.sh
@@ -32,7 +32,7 @@
 echo "SHADERC_REVISION=$SHADERC_REVISION"
 
 if [[ $(uname) == "Linux" ]]; then
-    cores=$(ncpus)
+    cores=$(ncpus || echo 4)
 elif [[ $(uname) == "Darwin" ]]; then
     cores=$(sysctl -n hw.ncpu)
 fi