build: allow "building" rts-alloc on windows (#22)

Author: OliverNChalk

Cargo.toml

@@ -7,5 +7,5 @@ license-file = "LICENSE"
 repository = "https://github.com/apfitzge/rts-alloc"
 authors = ["Andrew Fitzgerald <[email protected]>"]
 
-[dependencies]
+[target."cfg(unix)".dependencies]
 libc = { version = "0.2.174" }

src/lib.rs

@@ -1,3 +1,5 @@
+#![cfg(unix)]
+
 mod align;
 pub mod allocator;
 mod cache_aligned;