Add feature to allow compiling against more platforms for OpenDream

Author: PJB3005

crates/byondapi-rs/Cargo.toml

@@ -26,3 +26,4 @@ byond-515-1621 = [
     "byondapi-sys/byond-515-1621",
 ]
 byond-516-1651 = ["byondapi-sys/byond-516-1651"]
+opendream = ["byondapi-sys/opendream"]

crates/byondapi-sys/Cargo.toml

@@ -27,3 +27,4 @@ doxygen-rs = "0.4"
 default = ["byond-516-1651"]
 byond-515-1621 = []
 byond-516-1651 = []
+opendream = []

crates/byondapi-sys/src/lib.rs

@@ -7,13 +7,16 @@
 )]
 use std::ops::Deref;
 
-#[cfg(not(target_pointer_width = "32"))]
+#[cfg(all(not(target_pointer_width = "32"), not(feature = "opendream")))]
 compile_error!("BYOND API only functions with 32-bit targets");
 
-#[cfg(not(target_arch = "x86"))]
+#[cfg(all(not(target_arch = "x86"), not(feature = "opendream")))]
 compile_error!("BYOND API only functions on x86 targets");
 
-#[cfg(not(any(target_os = "linux", target_os = "windows")))]
+#[cfg(all(
+    not(any(target_os = "linux", target_os = "windows")),
+    not(feature = "opendream")
+))]
 compile_error!("BYOND API only supports Windows and Linux");
 
 // Include byondapi-c bindings (generated by build.rs)