Do not include default javacopts

rules_java already includes the toolchain's default javacopts when
compiling java_library.

Please see:
https://github.com/bazelbuild/rules_java/blob/f26a240c3392f0ae45a2ce3244c93713d7539611/java/common/rules/java_toolchain.bzl#L167

fixes bazelbuild#1685

scala/private/rule_impls.bzl

@@ -157,10 +157,7 @@ def compile_java(ctx, source_jars, source_files, output, extra_javac_opts, provi
         output = output,
         javac_opts = expand_location(
             ctx,
-            extra_javac_opts +
-            java_common.default_javac_opts(
-                java_toolchain = java_toolchain,
-            ),
+            extra_javac_opts
         ),
         deps = providers_of_dependencies,
         #exports can be empty since the manually created provider exposes exports