Remove a comment in compile/compile-cplus-types.c

The include sorter can't handle multi-line comments on the same line
as a #include.  This patch removes the only such comment.

In general I think these sorts of comments do not provide much value:
more often than not, I find that the comment is obsolete in one way or
another, and so the include sorter removes them in most cases.

gdb/ChangeLog
2019-01-22  Tom Tromey  <tom@tromey.com>

	* compile/compile-cplus-types.c: Remove a comment by #include.

gdb/compile/compile-cplus-types.c

@@ -32,8 +32,7 @@
 #include "block.h"
 #include "gdbcmd.h"
 #include "c-lang.h"
-#include "compile-c.h" 		/* Included for c_get_range_decl_name
-				   et al.  */
+#include "compile-c.h"
 #include <algorithm>
 
 /* Default compile flags for C++.  */