Fix building with Ninja (the "extern" dir, containing LodePNG, was not included)

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Fix building with Ninja (the "extern" dir, containing LodePNG, was not included) #522

Closed MrMetric closed 5 years ago

MrMetric commented 5 years ago

When building with Ninja, a linking error occurred, mentioning LodePNG functions. The problem is that the config generator includes only the src directory. This patch makes it also include the extern directory.