Add EAFNOSUPPORT.

libc/decl/errno_values.h

@@ -46,6 +46,7 @@
 #define EMLINK 54
 #define ENXIO 55
 #define EPROTONOSUPPORT 56
+#define EAFNOSUPPORT 57
 
 #define EOPNOTSUPP ENOTSUP
 

libc/strerror.cpp

@@ -75,6 +75,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case EMLINK: return "Too many links";
 	case ENXIO: return "No such device or address";
 	case EPROTONOSUPPORT: return "Protocol not supported";
+	case EAFNOSUPPORT: return "Address family not supported";
 	default: return "Unknown error condition";
 	}
 }