Make home great again

Makefile.toml

 [env]
 CARGO_MAKE_EXTEND_WORKSPACE_MAKEFILE = true
 CARGO_MAKE_WORKSPACE_INCLUDE_MEMBERS = ["native/dubp_rs"]
-ANDROID_PLATFORM_VERSION = "22"
+ANDROID_PLATFORM_VERSION = "21"
 TARGET_OS = "unknown"
 RELEASE = true
 DEV = false