patch 8.0.0445: getpgid is not supported on all systems

Problem:    Getpgid is not supported on all systems.
Solution:   Add a configure check.
diff --git a/src/version.c b/src/version.c
index db00cc7..7a0d500 100644
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    445,
+/**/
     444,
 /**/
     443,