[depr.c.macros][depr.cerrno][depr.atomics] Update macro indexing for known headers

Author: AlisdairM

source/future.tex

@@ -221,33 +221,27 @@
 
 \pnum
 The header \libheaderref{stdalign.h} has the following macros:
-\indexlibraryglobal{__alignas_is_defined}%
 \begin{codeblock}
-#define @\xname{alignas_is_defined}@ 1
-#define @\xname{alignof_is_defined}@ 1
+#define @\libxmacro{alignas_is_defined}@ 1
+#define @\libxmacro{alignof_is_defined}@ 1
 \end{codeblock}
 
 \pnum
 The header \libheaderref{stdbool.h} has the following macro:
-\indexlibraryglobal{__bool_true_false_are_defined}%
 \begin{codeblock}
-#define @\xname{bool_true_false_are_defined}@ 1
+#define @\libxmacro{bool_true_false_are_defined}@ 1
 \end{codeblock}
 
 \rSec1[depr.cerrno]{Deprecated error numbers}
 
 \pnum
 The header \libheaderref{cerrno} has the following additional macros:
 
-\indexlibraryglobal{ENODATA}%
-\indexlibraryglobal{ENOSR}%
-\indexlibraryglobal{ENOSTR}%
-\indexlibraryglobal{ETIME}%
 \begin{codeblock}
-#define ENODATA @\seebelow@
-#define ENOSR @\seebelow@
-#define ENOSTR @\seebelow@
-#define ETIME @\seebelow@
+#define @\libmacro{ENODATA}@ @\seebelow@
+#define @\libmacro{ENOSR}@ @\seebelow@
+#define @\libmacro{ENOSTR}@ @\seebelow@
+#define @\libmacro{ETIME}@ @\seebelow@
 \end{codeblock}
 
 \pnum
@@ -861,7 +855,7 @@
   template<class T>
     void atomic_init(atomic<T>*, typename atomic<T>::value_type) noexcept;
 
-  #define ATOMIC_VAR_INIT(value) @\seebelow@
+  #define @\libmacro{ATOMIC_VAR_INIT}@(value) @\seebelow@
 }
 \end{codeblock}
 
@@ -910,7 +904,7 @@
 
 \indexlibraryglobal{ATOMIC_VAR_INIT}%
 \begin{itemdecl}
-#define ATOMIC_VAR_INIT(value) @\seebelow@
+#define @\libmacro{ATOMIC_VAR_INIT}@(value) @\seebelow@
 \end{itemdecl}
 
 \begin{itemdescr}