Add ENOMSG.

libc/decl/errno_values.h

@@ -67,6 +67,7 @@
 #define ENETRESET 75
 #define ENETUNREACH 76
 #define ENOBUFS 77
+#define ENOMSG 78
 
 #define EOPNOTSUPP ENOTSUP
 

libc/strerror.cpp

@@ -96,6 +96,7 @@ extern "C" const char* sortix_strerror(int errnum)
 	case ENETRESET: return "Connection aborted by network";
 	case ENETUNREACH: return "Network is unreachable";
 	case ENOBUFS: return "No buffer space available";
+	case ENOMSG: return "No message of the desired type";
 	default: return "Unknown error condition";
 	}
 }