Borrow Cargo.toml's `profile.release` from RustDesk for better binary (#481)

Cargo.toml

@@ -58,3 +58,13 @@ hbb_common = { path = "libs/hbb_common" }
 [workspace]
 members = ["libs/hbb_common"]
 exclude = ["ui"]
+
+#https://github.com/johnthagen/min-sized-rust
+#https://doc.rust-lang.org/cargo/reference/profiles.html#default-profiles
+[profile.release]
+lto = true
+codegen-units = 1
+panic = 'abort'
+strip = true
+#opt-level = 'z' # only have smaller size after strip # Default is 3, better performance
+#rpath = true # Not needed