Fix compilation on GCC-13 (#443)

* Fix compilation on GCC-13

GCC-13 changes internal cstdint includes, and now files that uses
standart integer types should directly include cstdint header.

See: https://gcc.gnu.org/gcc-13/porting_to.html#header-dep-changes
Bug: https://bugs.gentoo.org/865117
Bug: https://bugs.gentoo.org/895440

* Convert line endings to Unix format

ixwebsocket/IXSelectInterrupt.h

@@ -6,8 +6,8 @@
 
 #pragma once
 
+#include <cstdint>
 #include <memory>
-#include <stdint.h>
 #include <string>
 
 namespace ix