[Patch][edk2-stable201908] BaseTools: fix an incremental build issue.

["Bob Feng" <bob.c.feng@intel.com>]

BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=2137

This patch is going to fix a regression issue of incremental
build which was introduced by the commit 94459080c.
The changing on INF file will not trigger module rebuild.

Signed-off-by: Bob Feng <bob.c.feng@intel.com>
Cc: Liming Gao <liming.gao@intel.com>
Cc: Steven Shi <steven.shi@intel.com>
---
 BaseTools/Source/Python/AutoGen/ModuleAutoGen.py | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
index 2cd0d3859e..f610365f6d 100755
--- a/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
+++ b/BaseTools/Source/Python/AutoGen/ModuleAutoGen.py
@@ -1764,16 +1764,12 @@ class ModuleAutoGen(AutoGen):
             for f in self.AutoGenDepSet:
                 FileSet.add (f.Path)
 
             if os.path.exists (self.TimeStampPath):
                 os.remove (self.TimeStampPath)
-            with tempfile.NamedTemporaryFile('w+', dir=os.path.dirname(self.TimeStampPath), delete=False) as tf:
-                for f in FileSet:
-                    tf.write(f)
-                    tf.write("\n")
-                tempname = tf.name
-            SaveFileOnChange(self.TimeStampPath, tempname, False)
+
+            SaveFileOnChange(self.TimeStampPath, "\n".join(FileSet), False)
 
         # Ignore generating makefile when it is a binary module
         if self.IsBinaryModule:
             return
 
-- 
2.20.1.windows.1