[clocale.syn] Improve indexing for macros

Author: AlisdairM

source/text.tex

@@ -4900,13 +4900,6 @@
 \indexlibraryglobal{lconv}%
 \indexlibraryglobal{setlocale}%
 \indexlibraryglobal{localeconv}%
-\indexlibraryglobal{NULL}%
-\indexlibraryglobal{LC_ALL}%
-\indexlibraryglobal{LC_COLLATE}%
-\indexlibraryglobal{LC_CTYPE}%
-\indexlibraryglobal{LC_MONETARY}%
-\indexlibraryglobal{LC_NUMERIC}%
-\indexlibraryglobal{LC_TIME}%
 \begin{codeblock}
 namespace std {
   struct lconv;
@@ -4915,13 +4908,13 @@
   lconv* localeconv();
 }
 
-#define NULL @\textit{see \ref{support.types.nullptr}}@
-#define LC_ALL @\seebelow@
-#define LC_COLLATE @\seebelow@
-#define LC_CTYPE @\seebelow@
-#define LC_MONETARY @\seebelow@
-#define LC_NUMERIC @\seebelow@
-#define LC_TIME @\seebelow@
+#define @\libmacro{NULL}@ @\textit{see \ref{support.types.nullptr}}@
+#define @\libmacro{LC_ALL}@ @\seebelow@
+#define @\libmacro{LC_COLLATE}@ @\seebelow@
+#define @\libmacro{LC_CTYPE}@ @\seebelow@
+#define @\libmacro{LC_MONETARY}@ @\seebelow@
+#define @\libmacro{LC_NUMERIC}@ @\seebelow@
+#define @\libmacro{LC_TIME}@ @\seebelow@
 \end{codeblock}
 
 \pnum