Restrict wasi attributes to wasi builds

Added simply to silence unknown attribute warnings when building for macOS using Xcode.

Author: STREGA

Sources/_CJavaScriptBigIntSupport/include/_CJavaScriptKit+I64.h

@@ -8,16 +8,20 @@
 ///
 /// @param value The value to convert.
 /// @param is_signed Whether to treat the value as a signed integer or not.
+#if __wasi__
 __attribute__((__import_module__("javascript_kit"),
                __import_name__("swjs_i64_to_bigint")))
+#endif
 extern JavaScriptObjectRef _i64_to_bigint(const long long value, bool is_signed);
 
 /// Converts the provided BigInt to an Int64 or UInt64.
 ///
 /// @param ref The target JavaScript object.
 /// @param is_signed Whether to treat the return value as a signed integer or not.
+#if __wasi__
 __attribute__((__import_module__("javascript_kit"),
                __import_name__("swjs_bigint_to_i64")))
+#endif
 extern long long _bigint_to_i64(const JavaScriptObjectRef ref, bool is_signed);
 
 #endif /* _CJavaScriptBigIntSupport_h */