Android: Fix gn gen failure for is_debug=false incremental_install=true

Change-Id: I9c5633c38d03ca0c4d4d10e246926a93a970e09a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2040003
Commit-Queue: Andrew Grieve <agrieve@chromium.org>
Auto-Submit: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Mohamed Heikal <mheikal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738818}

build/config/android/rules.gni

@@ -3190,7 +3190,7 @@ if (enable_java_templates) {
           # the proper bitness for the app.
           _has_native_libs =
               defined(invoker.native_libs_filearg) || _loadable_modules != []
-          if (_has_native_libs) {
+          if (_has_native_libs && !defined(native_lib_placeholders)) {
             native_lib_placeholders = [ "libfix.crbug.384638.so" ]
           }