Download WireCompiler jar in podspec instead of building from scratch (#2175)
Download WireCompiler jar in podspec instead of building from scratch (#2175)

We were previously building the compiler jar, which significantly slows
down `pod install` times and pollutes the dev machine environment with a
Gradle process. Instead, we'll now download the jar from Maven Central.

Used the Maven repo URL documented here, which uses a CDN for
distribution: https://maven.apache.org/guides/mini/guide-mirror-settings.html

Fixes #2173

Co-authored-by: Seth Friedman <bf09ac2ee16756f7dc1de8c01b9c4e4a4b06626e@users.noreply.github.com>
square/wire,square/wire,square/wire,square/wire,square/wire,square/wire