Don't gitignore src files under package named build
Don't gitignore src files under package named build

Test: Manually via git CLI
Change-Id: I30a2103e0edd0df4ca9bf6253f868563dfdcb5e8

AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx,androidx/androidx,androidx/androidx,androidx/androidx,AndroidX/androidx,AndroidX/androidx,androidx/androidx,AndroidX/androidx,androidx/androidx