Create ~/.rnd with mode 0600 instead of 0666

Because of a missing include <fcntl.h> we don't have O_CREATE and don't create
the file with open() using mode 0600 but fall back to using fopen() with the
default umask followed by a chmod().

Problem found by Jakub Wilk <jwilk@debian.org>.

crypto/rand/randfile.c

@@ -79,6 +79,7 @@
 #endif
 #ifndef OPENSSL_NO_POSIX_IO
 # include <sys/stat.h>
+# include <fcntl.h>
 #endif
 
 #ifdef _WIN32