remove unused Task::UNSPECIFIED

Fixes: 195987773
Test: aidl_unittests
Change-Id: I73ad85484efe311904e11b9ede44b03b7a1854fc
diff --git a/options.h b/options.h
index 9f645a8..70c82a6 100644
--- a/options.h
+++ b/options.h
@@ -77,7 +77,7 @@
  public:
   enum class Language { UNSPECIFIED, JAVA, CPP, NDK, RUST };
 
-  enum class Task { UNSPECIFIED, HELP, COMPILE, PREPROCESS, DUMP_API, CHECK_API, DUMP_MAPPINGS };
+  enum class Task { HELP, COMPILE, PREPROCESS, DUMP_API, CHECK_API, DUMP_MAPPINGS };
 
   enum class CheckApiLevel { COMPATIBLE, EQUAL };