patch 8.2.2587: recover test fails on FreeBSD

Problem:    Recover test fails on FreeBSD.
Solution:   Check for Linux.
diff --git a/src/testdir/check.vim b/src/testdir/check.vim
index e5298bc..db16cfb 100644
--- a/src/testdir/check.vim
+++ b/src/testdir/check.vim
@@ -84,8 +84,16 @@
   endif
 endfunc
 
+" Command to check for running on Linix
+command CheckLinux call CheckLinux()
+func CheckLinux()
+  if !has('linux')
+    throw 'Skipped: only works on Linux'
+  endif
+endfunc
+
 " Command to check for not running on a BSD system.
-" TODO: using this checks should not be needed
+" TODO: using this check should not be needed
 command CheckNotBSD call CheckNotBSD()
 func CheckNotBSD()
   if has('bsd')
diff --git a/src/testdir/test_recover.vim b/src/testdir/test_recover.vim
index 621e315..2867663 100644
--- a/src/testdir/test_recover.vim
+++ b/src/testdir/test_recover.vim
@@ -79,8 +79,9 @@
 endfunc
 
 func Test_nocatch_process_still_running()
-  " assume Unix means sysinfo.uptime can be used
-  CheckUnix
+  " sysinfo.uptime probably only works on Linux
+  CheckLinux
+  " the GUI dialog can't be handled
   CheckNotGui
 
   " don't intercept existing swap file here
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,