Android x64: set use_mold=false

This fixes the following error:

```
ninja: Entering directory `/home/runner/work/pdfium-binaries/pdfium-binaries/pdfium/out'
ninja: error: '../buildtools/third_party/mold/cipd/bin/mold', needed by 'phony/pdfium.inputs', missing and no known rule to make
```

Caused by https://chromium.googlesource.com/chromium/src/build/+/4808da17506fd114fb810356f5ed3651bcb83db5

Author: bblanchon

steps/05-configure.sh

@@ -35,6 +35,7 @@ mkdir -p "$BUILD"
     android)
       echo "clang_use_chrome_plugins = false"
       echo "default_min_sdk_version = 23"
+      echo "use_mold = false"
       ;;
     ios)
       [ -n "$TARGET_ENVIRONMENT" ] && echo "target_environment = \"$TARGET_ENVIRONMENT\""