<linux/kernel.h>: drop the gcc-3.3 'const' hack in roundup()

The single quotation marks around "const" were causing a documentation
markup warning with reST.  Instead of fixing that warning, just delete
that comment line and the gcc-3.3 hack of using "const" in the roundup()
macro since gcc-3.3 is no longer supported for kernel builds.

I did around 20 different $arch builds with no problems, but we'll just
have to see if this causes problems for anyone else out there.

Link: http://lkml.kernel.org/r/ec5dcf72-7c3e-3513-af0c-4003ed598854@infradead.org
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Suggested-by: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/linux/kernel.h

@@ -134,12 +134,10 @@
  *
  * Rounds @x up to next multiple of @y. If @y will always be a power
  * of 2, consider using the faster round_up().
- *
- * The `const' here prevents gcc-3.3 from calling __divdi3
  */
 #define roundup(x, y) (					\
 {							\
-	const typeof(y) __y = y;			\
+	typeof(y) __y = y;				\
 	(((x) + (__y - 1)) / __y) * __y;		\
 }							\
 )