support libs for android_library

adds support for *-> android_library and android_library->* edges

Change-Id: I41d4e1d1b8106a17e67951d47e67b59ef3170d17
Test: manually inspected build files for libWallpaperPicker & android-suppor-v4

bp2build/aar_conversion_test.go

@@ -68,6 +68,7 @@ android_library {
 					"exports":        `[":static_lib_dep"]`,
 					"javacopts":      `["-source 1.7 -target 1.7"]`,
 				}),
+			MakeNeverlinkDuplicateTarget("android_library", "TestLib"),
 		}})
 }