Don't try to build out-of-line aarch64 atomics with the msvc toolchain

The msvc toolchain does not support building `.s` files, clang only
supports generating out-of-line atomics on Linux and gcc does not
support aarch64 for Windows at all. Therefore, we don't need to compile
`lse.s` on `aarch64-pc-windows-msvc`.

Author: wesleywiser

build.rs

@@ -491,8 +491,9 @@ mod c {
 
         // Include out-of-line atomics for aarch64, which are all generated by supplying different
         // sets of flags to the same source file.
+        // Note: Out-of-line aarch64 atomics are not supported by the msvc toolchain (#430).
         let src_dir = root.join("lib/builtins");
-        if target_arch == "aarch64" {
+        if target_arch == "aarch64" && target_env != "msvc" {
             let atomics_libs = build_aarch64_out_of_line_atomics_libraries(&src_dir, cfg);
             if !atomics_libs.is_empty() {
                 for library in atomics_libs {