Library name dependent on target environment

synth/build.rs

 extern crate nasm_rs;
 
 fn main() {
+	#[cfg(not(target_env = "msvc"))]
+	nasm_rs::compile_library("libadditive.a", &["src/additive.asm"]);
+
+	#[cfg(target_env = "msvc")]
 	nasm_rs::compile_library("additive.lib", &["src/additive.asm"]);
+
 	println!("cargo:rustc-link-lib=static=additive");
 }