elf/dl-exception.c: Include <_itoa.h> for _itoa prototype

Tested with build-many-glibcs.py.

	* elf/dl-exception.c: Include <_itoa.h>.

ChangeLog

@@ -1,3 +1,7 @@
+2018-11-29  H.J. Lu  <hongjiu.lu@intel.com>
+
+	* elf/dl-exception.c: Include <_itoa.h>.
+
 2018-11-30  Samuel Thibault  <samuel.thibault@ens-lyon.org>
 
 	* sysdeps/mach/hurd/fcntl.c (__libc_fcntl): Directly return value

elf/dl-exception.c

@@ -23,6 +23,7 @@
 #include <stdint.h>
 #include <string.h>
 #include <unistd.h>
+#include <_itoa.h>
 
 /* This message we return as a last resort.  We define the string in a
    variable since we have to avoid freeing it and so have to enable