[SPARC]: Kill CHILD_MAX.

It's definition is wrong (-1 means "no limit" not 999),
only the Sparc SunOS/Solaris compat code uses it, so
let's just kill it off completely from limits.h and
all referencing code.

Noticed by Ulrich Drepper.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/arch/sparc/kernel/sys_sunos.c b/arch/sparc/kernel/sys_sunos.c
index 81c894a..d07ae02 100644
--- a/arch/sparc/kernel/sys_sunos.c
+++ b/arch/sparc/kernel/sys_sunos.c
@@ -894,7 +894,7 @@
 		ret = ARG_MAX;
 		break;
 	case _SC_CHILD_MAX:
-		ret = CHILD_MAX;
+		ret = -1; /* no limit */
 		break;
 	case _SC_CLK_TCK:
 		ret = HZ;