Configure Babel not to read input sourcemaps
Configure Babel not to read input sourcemaps

This confuses Rollup, which expects to see a map from plugin input
to output, not from original source to output. Thanks to Cory
for figuring this out!

Signed-off-by: Liam McLoughlin <a63c1d66dbd75d3cc434e11bdf376be6f9ff043b@fitbit.com>

Fitbit/fitbit-sdk-toolchain,Fitbit/fitbit-sdk-toolchain