patch 8.2.2587: recover test fails on FreeBSD

Problem:    Recover test fails on FreeBSD.
Solution:   Check for Linux.
diff --git a/src/version.c b/src/version.c
index b624a71..df8d2f9 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2587,
+/**/
     2586,
 /**/
     2585,