LibCore: Include sys/filio.h for file-related ioctls on Solaris

Author: https://github.com/ghost
Commit: https://github.com/SerenityOS/serenity/commit/9139515aed6
Pull-request: https://github.com/SerenityOS/serenity/pull/17623
Reviewed-by: https://github.com/ADKaster ✅
Reviewed-by: https://github.com/elcuco
Reviewed-by: https://github.com/kleinesfilmroellchen ✅
Reviewed-by: https://github.com/linusg

Userland/Libraries/LibCore/System.h

@@ -35,6 +35,10 @@
 #    include <shadow.h>
 #endif
 
+#ifdef AK_OS_SOLARIS
+#    include <sys/filio.h>
+#endif
+
 namespace Core::System {
 
 #ifdef AK_OS_SERENITY