build/envsetup.h → build/envsetup.sh typo fix am: 1d532d77ea

Original change: https://android-review.googlesource.com/c/platform/external/cronet/+/2952894

Change-Id: Id171972a420b2e7246d51c933f9e8a191fc23d84
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>