stat: get rid on intmax_t

function                                             old     new   delta
print_it                                             225     218      -7
print_stat                                           919     889     -30
print_statfs                                         370     339     -31
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(add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-68)             Total: -68 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/include/libbb.h b/include/libbb.h
index 09852d0..3b7eea2 100644
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -20,6 +20,7 @@
 #include <netdb.h>
 #include <setjmp.h>
 #include <signal.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <stdarg.h>