patch 9.0.1015: without /dev/urandom srand() seed is too predictable

Problem:    Without /dev/urandom srand() seed is too predictable.
Solution:   Use micro seconds and XOR with process ID. (Yasuhiro Matsumoto,
            closes #11656)
diff --git a/src/version.c b/src/version.c
index 9e4411e..a19d947 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1015,
+/**/
     1014,
 /**/
     1013,