Fix annotations artifact (#61)

Summary:
These appear to be intended to be a plain java library but were still defined as an aar, which then had a conflicting manifest package name as well.

Resolves #58
Pull Request resolved: #61

Test Plan: {F234018852}

Reviewed By: oprisnik

Differential Revision: D20940655

Pulled By: passy

fbshipit-source-id: 0b02297af92a16913c77302c484e15302095240d

.buckconfig

@@ -1,12 +1,6 @@
 [alias]
 [java]
     src_roots = /java/
-[project]
-    # IntelliJ requires that every Android module have an
-    # AndroidManifest.xml file associated with it. In practice,
-    # most of this is unnecessary boilerplate, so we create one
-    # "shared" AndroidManifest.xml file that can be used as a default.
-    default_android_manifest = //res/AndroidManifest.xml
 [android]
     target = android-26
     build_tools_version = 27.0.3

BUCK

@@ -14,10 +14,8 @@ export_file(
     out = "nativeloader.jar",
 )
 
-android_aar(
+export_file(
     name = "annotation",
-    manifest_skeleton = "AndroidManifestSkeleton.xml",
-    deps = [
-        "//java/com/facebook/soloader:annotation",
-    ],
+    src = "//java/com/facebook/soloader:annotation",
+    out = "annotation.jar",
 )