Add missing includes.

Follow-up to commits 38de94a5ef,
76da726532.

ChangeLog

@@ -1,3 +1,8 @@
+2012-07-22  Thomas Schwinge  <thomas@codesourcery.com>
+
+	* math/w_ilogb.c: Include <limits.h>.
+	* math/w_ilogbl.c: Likewise.
+
 2012-07-20  Joseph Myers  <joseph@codesourcery.com>
 
 	* manual/lang.texi (__va_copy): Document primarily as ISO C99

math/w_ilogb.c

@@ -18,6 +18,7 @@
 
 #include <math.h>
 #include <errno.h>
+#include <limits.h>
 #include <math_private.h>
 
 /* wrapper ilogb */
@@ -34,7 +35,6 @@ __ilogb (double x)
     }
   return r;
 }
-
 weak_alias (__ilogb, ilogb)
 #ifdef NO_LONG_DOUBLE
 strong_alias (__ilogb, __ilogbl)

math/w_ilogbf.c

@@ -35,5 +35,4 @@ __ilogbf (float x)
     }
   return r;
 }
-
 weak_alias (__ilogbf, ilogbf)

math/w_ilogbl.c

@@ -18,6 +18,7 @@
 
 #include <math.h>
 #include <errno.h>
+#include <limits.h>
 #include <math_private.h>
 
 /* wrapper ilogbl */