Revert no-std profile changes and fix README.

no_std/no_std_test/Cargo.toml

@@ -23,6 +23,16 @@ opt-level = "z"             # optimize for size
 debug = false
 rpath = false
 debug-assertions = false
-panic = "abort"
 codegen-units = 1
+panic = "abort"
+
+[profile.unix]
+inherits = "release"
 lto = true
+
+[profile.windows]
+inherits = "release"
+
+[profile.macos]
+inherits = "release"
+lto = "fat"

no_std/no_std_test/README.md

@@ -12,7 +12,7 @@ To Compile
 The nightly compiler is required:
 
 ```bash
-cargo +nightly build --release
+cargo +nightly build --profile unix -Z unstable-options
 ```
 
 Available profiles are: `unix`, `windows` and `macos`.