source jars passed as rule srcs attributes were being included as nes…

…ted source jars. Exclude them by only including kt + java source files, since the source jars are included in the source_jars field already. (#507)

kotlin/internal/jvm/compile.bzl

@@ -601,7 +601,7 @@ def kt_jvm_produce_jar_actions(ctx, rule_kind):
         ctx.actions,
         output_jar = output_jar,
         output_source_jar = ctx.outputs.srcjar,
-        sources = ctx.files.srcs,
+        sources = srcs.kt + srcs.java,
         source_jars = srcs.src_jars + generated_src_jars,
         java_toolchain = toolchains.java,
         host_javabase = toolchains.java_runtime,