[PATCH] ld: fix build with old makeinfo

[Jan Beulich]

Makeinfo 4.12 is unhappy about the new "Special Sections" without that
also having a @chapter line.

--- a/ld/ld.texi
+++ b/ld/ld.texi
@@ -7527,6 +7527,7 @@ the @samp{__.LIBDEP} member of @file{lib
 @end smallexample
 
 @node Special Sections
+@chapter Special Sections
 When linking ELF format object files @command{ld} treats some sections
 in a special, non standard manner.  This part of the manual describes
 these sections.