target-arm: Remove stray #include from middle of neon_helper.c

Remove a stray #include <stdio.h> from the middle of neon_helper.c:
it was harmless but pointless since we include stdio.h at the top
of the file anyway.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

target-arm/neon_helper.c

@@ -1484,7 +1484,6 @@ uint64_t HELPER(neon_negl_u16)(uint64_t x)
     return result;
 }
 
-#include <stdio.h>
 uint64_t HELPER(neon_negl_u32)(uint64_t x)
 {
     uint32_t low = -x;