[PATCH 2/2] BaseTools: Work around array.array.tostring() removal in python 3.9

["Cole" <crobinso@redhat.com>]

In python3, array.array.tostring() was a compat alias for tobytes().
tostring() was removed in python 3.9.

Convert this to use tolist() which should be valid for all python
versions.

This fixes this build error on python3.9:

(Python 3.9.0b5 on linux) Traceback (most recent call last):
  File "/root/edk2/edk2-edk2-stable202002/BaseTools/BinWrappers/PosixLike/../../Source/Python/Trim/Trim.py", line 593, in Main
    GenerateVfrBinSec(CommandOptions.ModuleName, CommandOptions.DebugDir, CommandOptions.OutputFile)
  File "/root/edk2/edk2-edk2-stable202002/BaseTools/BinWrappers/PosixLike/../../Source/Python/Trim/Trim.py", line 449, in GenerateVfrBinSec
    VfrUniOffsetList = GetVariableOffset(MapFileName, EfiFileName, VfrNameList)
  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 88, in GetVariableOffset
    return _parseForGCC(lines, efifilepath, varnames)
  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 151, in _parseForGCC
    efisecs = PeImageClass(efifilepath).SectionHeaderList
  File "/root/edk2/edk2-edk2-stable202002/BaseTools/Source/Python/Common/Misc.py", line 1638, in __init__
    if ByteArray.tostring() != b'PE\0\0':
AttributeError: 'array.array' object has no attribute 'tostring'

Signed-off-by: Cole Robinson <crobinso@redhat.com>
---
 BaseTools/Source/Python/Common/Misc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/BaseTools/Source/Python/Common/Misc.py b/BaseTools/Source/Python/Common/Misc.py
index ad55671080..4be7957138 100755
--- a/BaseTools/Source/Python/Common/Misc.py
+++ b/BaseTools/Source/Python/Common/Misc.py
@@ -1635,7 +1635,7 @@ class PeImageClass():
         ByteArray = array.array('B')
         ByteArray.fromfile(PeObject, 4)
         # PE signature should be 'PE\0\0'
-        if ByteArray.tostring() != b'PE\0\0':
+        if ByteArray.tolist() != [ord('P'), ord('E'), 0, 0]:
             self.ErrorInfo = self.FileName + ' has no valid PE signature PE00'
             return
 
-- 
2.26.2