Remove obsolete \setindexsubitem macro.

Doc/lib/libre.tex

@@ -268,7 +268,6 @@ for the current locale.
 
 The module defines the following functions and constants, and an exception:
 
-\setindexsubitem{(in module re)}
 
 \begin{funcdesc}{compile}{pattern\optional{, flags}}
   Compile a regular expression pattern into a regular expression

Doc/lib/libsignal.tex

@@ -62,7 +62,6 @@ communication.  Use locks instead.
 
 The variables defined in the \module{signal} module are:
 
-\setindexsubitem{(in module signal)}
 \begin{datadesc}{SIG_DFL}
   This is one of two standard signal handling options; it will simply
   perform the default function for the signal.  For example, on most

Doc/lib/libsys.tex

@@ -6,7 +6,6 @@ This module provides access to some variables used or maintained by the
 interpreter and to functions that interact strongly with the interpreter.
 It is always available.
 
-\setindexsubitem{(in module sys)}
 
 \begin{datadesc}{argv}
   The list of command line arguments passed to a Python script.

Doc/libre.tex

@@ -268,7 +268,6 @@ for the current locale.
 
 The module defines the following functions and constants, and an exception:
 
-\setindexsubitem{(in module re)}
 
 \begin{funcdesc}{compile}{pattern\optional{, flags}}
   Compile a regular expression pattern into a regular expression

Doc/libsignal.tex

@@ -62,7 +62,6 @@ communication.  Use locks instead.
 
 The variables defined in the \module{signal} module are:
 
-\setindexsubitem{(in module signal)}
 \begin{datadesc}{SIG_DFL}
   This is one of two standard signal handling options; it will simply
   perform the default function for the signal.  For example, on most

Doc/libsys.tex

@@ -6,7 +6,6 @@ This module provides access to some variables used or maintained by the
 interpreter and to functions that interact strongly with the interpreter.
 It is always available.
 
-\setindexsubitem{(in module sys)}
 
 \begin{datadesc}{argv}
   The list of command line arguments passed to a Python script.