Setup dist task to assemble libs for compiler distribution.

Produce special stdlib artifact with annotations for dist.
Put js outputs to dist, they're required for JS backend tests.

Use kotlin-compiler for maven, which has all required dependencies bundled.
Clean local directory repository on clean.

Change paths in tests to compiled artifacts.

libraries/tools/binary-compatibility-validator/build.gradle

@@ -23,6 +23,7 @@ compileTestKotlin {
 
 test {
     dependsOn cleanCompileTestKotlin
+    dependsOn(':kotlin-runtime:jar')
     dependsOn(':kotlin-stdlib:originalStdlibJar')
 
     systemProperties['overwrite.output'] = System.getProperty("overwrite.output", "false")