Make use of \longprogramopt where appropriate.

Doc/lib/libexcs.tex

@@ -137,7 +137,7 @@ Raised when an \keyword{assert} statement fails.
 \begin{excdesc}{FloatingPointError}
   Raised when a floating point operation fails.  This exception is
   always defined, but can only be raised when Python is configured
-  with the \programopt{-}\programopt{-with-fpectl} option, or the
+  with the \longprogramopt{with-fpectl} option, or the
   \constant{WANT_SIGFPE_HANDLER} symbol is defined in the
   \file{config.h} file.
 \end{excdesc}

Doc/lib/libsys.tex

@@ -89,7 +89,7 @@ the other two are undefined.
 A string giving the site-specific directory prefix where the
 platform-dependent Python files are installed; by default, this is
 also \code{'/usr/local'}.  This can be set at build time with the
-\programopt{-}\programopt{-exec-prefix} argument to the
+\longprogramopt{exec-prefix} argument to the
 \program{configure} script.  Specifically, all configuration files
 (e.g. the \file{config.h} header file) are installed in the directory
 \code{exec_prefix + '/lib/python\var{version}/config'}, and shared
@@ -199,7 +199,7 @@ components to \code{path}, for instance.
 A string giving the site-specific directory prefix where the platform
 independent Python files are installed; by default, this is the string
 \code{'/usr/local'}.  This can be set at build time with the
-\programopt{-}\programopt{-prefix} argument to the
+\longprogramopt{prefix} argument to the
 \program{configure} script.  The main collection of Python library
 modules is installed in the directory \code{prefix +
 '/lib/python\var{version}'} while the platform independent header