[PATCH v2] BaseTools/Workspace: Fix ValueChain set

["Marvin Häuser" <Marvin.Haeuser@outlook.com>]

Commit 88252a90d1ca7846731cd2e4e8e860454f7d97a3 changed ValueChain
from a dict to a set, but also changed the (former) key type from a
touple to two separate values, which was probably unintended and also
breaks build for packages involving Structured PCDs, because add()
only takes one argument.
This commit changes the values back to touples.

V2:
  - Removed a whitespace change.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Marvin Haeuser <Marvin.Haeuser@outlook.com>
---
 BaseTools/Source/Python/Workspace/DscBuildData.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/BaseTools/Source/Python/Workspace/DscBuildData.py b/BaseTools/Source/Python/Workspace/DscBuildData.py
index 8476543c5352..0262a91ed855 100644
--- a/BaseTools/Source/Python/Workspace/DscBuildData.py
+++ b/BaseTools/Source/Python/Workspace/DscBuildData.py
@@ -1347,7 +1347,7 @@ class DscBuildData(PlatformBuildClassObject):
                         nextskuid = self.SkuIdMgr.GetNextSkuId(nextskuid)
                     stru_pcd.SkuOverrideValues[skuid] = copy.deepcopy(stru_pcd.SkuOverrideValues[nextskuid]) if not NoDefault else copy.deepcopy({defaultstorename: stru_pcd.DefaultValues for defaultstorename in DefaultStores} if DefaultStores else {TAB_DEFAULT_STORES_DEFAULT:stru_pcd.DefaultValues})
                     if not NoDefault:
-                        stru_pcd.ValueChain.add(skuid,'')
+                        stru_pcd.ValueChain.add((skuid,''))
             if stru_pcd.Type in [self._PCD_TYPE_STRING_[MODEL_PCD_DYNAMIC_HII], self._PCD_TYPE_STRING_[MODEL_PCD_DYNAMIC_EX_HII]]:
                 for skuid in SkuIds:
                     nextskuid = skuid
@@ -1366,7 +1366,7 @@ class DscBuildData(PlatformBuildClassObject):
                     for defaultstoreid in DefaultStores:
                         if defaultstoreid not in stru_pcd.SkuOverrideValues[skuid]:
                             stru_pcd.SkuOverrideValues[skuid][defaultstoreid] = copy.deepcopy(stru_pcd.SkuOverrideValues[nextskuid][mindefaultstorename])
-                            stru_pcd.ValueChain.add(skuid,defaultstoreid)
+                            stru_pcd.ValueChain.add((skuid,defaultstoreid))
         S_pcd_set = DscBuildData.OverrideByFdfComm(S_pcd_set)
         Str_Pcd_Values = self.GenerateByteArrayValue(S_pcd_set)
         if Str_Pcd_Values:
-- 
2.17.0.windows.1