Auto merge of #15069 - heycam:bindgen-regex-update, r=emilio
Auto merge of #15069 - heycam:bindgen-regex-update, r=emilio

Update geckolib build-time bindgen build script for recent regex changes.

`./mach build-geckolib --with-gecko ...` is broken due to regex's API changing a bit.

r? @Manishearth

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