Merge "Source vendorsetup.sh scripts anywhere within the repo." am: e98d29b4...

Merge "Source vendorsetup.sh scripts anywhere within the repo." am: e98d29b4 am: 9b15ad35 am: 76ffe4f5 am: 04e9258e

Original change: https://android-review.googlesource.com/c/platform/build/+/1455806

Change-Id: Ib27e605e75d1f580959233115c546cfcf27f0ef8