patch 9.0.0648: when using powershell input redirection does not work

Problem:    When using powershell input redirection does not work.
Solution:   Use a different shell command for powershell. (Yegappan
            Lakshmanan, closes #11257)
diff --git a/src/version.c b/src/version.c
index 4c73092..7a5d495 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    648,
+/**/
     647,
 /**/
     646,