[OE-core] [PATCH] classes/sstate: don't overwrite buildhistory vardepsexclude

[Paul Eggleton]

This was stomping over the value added in buildhistory.bbclass, leading
to task signatures *still* changing when buildhistory was added to
INHERIT.

Fixes [YOCTO #5897].

Signed-off-by: Paul Eggleton <paul.eggleton at linux.intel.com>
---
 meta/classes/sstate.bbclass | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/meta/classes/sstate.bbclass b/meta/classes/sstate.bbclass
index 9e09a73..03ee820 100644
--- a/meta/classes/sstate.bbclass
+++ b/meta/classes/sstate.bbclass
@@ -215,7 +215,7 @@ def sstate_install(ss, d):
     for lock in locks:
         bb.utils.unlockfile(lock)
 
-sstate_install[vardepsexclude] = "SSTATE_DUPWHITELIST STATE_MANMACH SSTATE_MANFILEPREFIX"
+sstate_install[vardepsexclude] += "SSTATE_DUPWHITELIST STATE_MANMACH SSTATE_MANFILEPREFIX"
 sstate_install[vardeps] += "${SSTATEPOSTINSTFUNCS}"
 
 def sstate_installpkg(ss, d):
-- 
1.8.5.3