Move LoggedExec to minimumRuntime source set (#36453)

This moves LoggedExec to the minimumRuntime source set so that it correctly 
compiles for earlier Java versions, namely Java 8.

buildSrc/build.gradle

@@ -95,6 +95,7 @@ dependencies {
   }
   minimumRuntimeCompile "junit:junit:${props.getProperty('junit')}"
   minimumRuntimeCompile localGroovy()
+  minimumRuntimeCompile gradleApi()
 }
 jar {
   from sourceSets.minimumRuntime.output