Cleanup includes in rand_unix.c

Fixes #9757
Reviewed-by: NRichard Levitte <levitte@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/9761)

(cherry picked from commit 41ffd2ab09d24692c71850ccd7d5ff154196fe01)

crypto/rand/rand_unix.c

@@ -19,11 +19,12 @@
 #include "internal/rand_int.h"
 #include <stdio.h>
 #include "internal/dso.h"
-#if defined(__linux)
-# include <asm/unistd.h>
-# include <sys/ipc.h>
-# include <sys/shm.h>
-# include <sys/utsname.h>
+#ifdef __linux
+# include <sys/syscall.h>
+# ifdef DEVRANDOM_WAIT
+#  include <sys/shm.h>
+#  include <sys/utsname.h>
+# endif
 #endif
 #if defined(__FreeBSD__) && !defined(OPENSSL_SYS_UEFI)
 # include <sys/types.h>