Merge 3.4 (os.urandom)
diff --git a/Python/random.c b/Python/random.c
index 1d57b1b..772bfef 100644
--- a/Python/random.c
+++ b/Python/random.c
@@ -111,6 +111,8 @@
 
 #else
 
+/* Issue #25003: Don' use getentropy() on Solaris (available since
+ * Solaris 11.3), it is blocking whereas os.urandom() should not block. */
 #if defined(HAVE_GETRANDOM) || defined(HAVE_GETRANDOM_SYSCALL)
 #define PY_GETRANDOM 1