This commit removes JDiff from the Spring Framework build and instead,
adds a Gradle plugin that configure JApiCmp tasks on the framework
modules.
Fixes gh-22942
See gh-23282
This commit moves the compile configuration from the Gradle DSL to a
convention. This configuration is not changing often, and we're using
that opportunity to make the Java source compatibility a project
property so as to easily recent JDKs this on the command line.
See gh-23282
陈其苗
Sam Brannen
Brian Clozel