BaseTools: Remove the "from __future__ import" items

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Yunhua Feng <yunhuax.feng@intel.com>
Reviewed-by: Liming Gao <liming.gao@intel.com>

BaseTools/Source/Python/GenFds/GuidSection.py

@@ -16,7 +16,6 @@
 ##
 # Import Modules
 #
-from __future__ import absolute_import
 from . import Section
 import subprocess
 from .Ffs import Ffs