package/wipe: fix musl build

The build error was not yet found by the autobuilders:

In file included from main.c:46:0:
rand.h:31:9: error: unknown type name ‘u_int32_t’
 typedef u_int32_t u_rand_t;
         ^
<builtin>: recipe for target 'main.o' failed

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Reviewed-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>