Fixed regenerating config on each build

[Przytua]

When output file already exist, the script is not ran, even when configuration has changed. This causes a bug when using react-native run-ios --scheme <scheme> with different configurations for different schemes, resulting in having old configuration in the Config object, while environment variables are set properly.

Cleaning build folder (or derived data) manually before build with changed configuration fixes this problem, but also causes a rebuild of all dependencies which may be much longer, depending on the size of the project (and obviously is error prone).

When the output_files section of the script does not contain path to the generated file, it is recreated for every build, thus forcing the pod to rebuild, and results in having a proper config, while extending the build time imperceptibly.

[height]

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[luancurti]

Thanks!