JDBC module's generateSql no longer tied to build lifecycle

Changes requiring schema generation are exceedingly rare; favor
manual execution of `gradle generateSql` for the time being.

Generated sources are checked into the tree at
src/main/resources/org/springframework/integration; simply regenerate
and copy to this location manually as necessary.

build.gradle

@@ -400,7 +400,6 @@ project('spring-integration-xmpp') {
     }
 }
 
-
 // add basic tasks like 'clean' and 'assemble' to the root project. e.g.: allows
 // running `gradle clean` from the root project and deleting the build directory
 apply plugin: 'base'