Change {datadesc} environments with empty descriptions to \dataline{}s; this

removes extra vertical space from the list of names, and makes the display
more similar to that used in the socket module, where several constants share
a description.

Doc/lib/libposix.tex

@@ -477,30 +477,18 @@ status is available immediately.
 
 
 \begin{datadesc}{O_RDONLY}
-\end{datadesc}
-\begin{datadesc}{O_WRONLY}
-\end{datadesc}
-\begin{datadesc}{O_RDWR}
-\end{datadesc}
-\begin{datadesc}{O_NDELAY}
-\end{datadesc}
-\begin{datadesc}{O_NONBLOCK}
-\end{datadesc}
-\begin{datadesc}{O_APPEND}
-\end{datadesc}
-\begin{datadesc}{O_DSYNC}
-\end{datadesc}
-\begin{datadesc}{O_RSYNC}
-\end{datadesc}
-\begin{datadesc}{O_SYNC}
-\end{datadesc}
-\begin{datadesc}{O_NOCTTY}
-\end{datadesc}
-\begin{datadesc}{O_CREAT}
-\end{datadesc}
-\begin{datadesc}{O_EXCL}
-\end{datadesc}
-\begin{datadesc}{O_TRUNC}
+\dataline{O_WRONLY}
+\dataline{O_RDWR}
+\dataline{O_NDELAY}
+\dataline{O_NONBLOCK}
+\dataline{O_APPEND}
+\dataline{O_DSYNC}
+\dataline{O_RSYNC}
+\dataline{O_SYNC}
+\dataline{O_NOCTTY}
+\dataline{O_CREAT}
+\dataline{O_EXCL}
+\dataline{O_TRUNC}
 Options for the \code{flag} argument to the \code{open()} function.
 These can be bit-wise OR'd together.
 \end{datadesc}

Doc/libposix.tex

@@ -477,30 +477,18 @@ status is available immediately.
 
 
 \begin{datadesc}{O_RDONLY}
-\end{datadesc}
-\begin{datadesc}{O_WRONLY}
-\end{datadesc}
-\begin{datadesc}{O_RDWR}
-\end{datadesc}
-\begin{datadesc}{O_NDELAY}
-\end{datadesc}
-\begin{datadesc}{O_NONBLOCK}
-\end{datadesc}
-\begin{datadesc}{O_APPEND}
-\end{datadesc}
-\begin{datadesc}{O_DSYNC}
-\end{datadesc}
-\begin{datadesc}{O_RSYNC}
-\end{datadesc}
-\begin{datadesc}{O_SYNC}
-\end{datadesc}
-\begin{datadesc}{O_NOCTTY}
-\end{datadesc}
-\begin{datadesc}{O_CREAT}
-\end{datadesc}
-\begin{datadesc}{O_EXCL}
-\end{datadesc}
-\begin{datadesc}{O_TRUNC}
+\dataline{O_WRONLY}
+\dataline{O_RDWR}
+\dataline{O_NDELAY}
+\dataline{O_NONBLOCK}
+\dataline{O_APPEND}
+\dataline{O_DSYNC}
+\dataline{O_RSYNC}
+\dataline{O_SYNC}
+\dataline{O_NOCTTY}
+\dataline{O_CREAT}
+\dataline{O_EXCL}
+\dataline{O_TRUNC}
 Options for the \code{flag} argument to the \code{open()} function.
 These can be bit-wise OR'd together.
 \end{datadesc}