Enable math module for all "none" os targets

This was initially a bugfix that fixed gating math module for riscv32,
but conclusiion is it makes no sense to gate on target architecture.

Author: mchodzikiewicz

src/lib.rs

@@ -45,11 +45,8 @@ pub mod int;
 
 #[cfg(any(
     all(target_family = "wasm", target_os = "unknown"),
-    all(target_arch = "x86_64", target_os = "none"),
     target_os = "uefi",
-    all(target_arch = "arm", target_os = "none"),
-    all(target_arch = "xtensa", target_os = "none"),
-    all(target_arch = "mips", target_os = "none"),
+    target_os = "none",
     target_os = "xous",
     all(target_vendor = "fortanix", target_env = "sgx"),
     target_os = "windows"