BaseTools: Fix MSVC AARCH64 Building of tools.

[apop5]

Description

Latest MSVC update started wanring on zero extending of ~. Add explicit casts to fix AARCH64 build errors.

Errors can be viewed in #1587 when attempting to build tools for AARCH64 using MSVC.

• Impacts functionality?
• Impacts security?
• Breaking change?
• Includes tests?
• Includes documentation?

How This Was Tested

Local build to reproduce the errors.
Local build succeeds after changes.

Integration Instructions

No integration necessary.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
⚠️ Please upload report for BASE (release/202502@796bda9). Learn more about missing BASE report.

Additional details and impacted files

@@                Coverage Diff                @@
##             release/202502    #1597   +/-   ##
=================================================
  Coverage                  ?    2.22%           
=================================================
  Files                     ?     1459           
  Lines                     ?   380786           
  Branches                  ?     4583           
=================================================
  Hits                      ?     8477           
  Misses                    ?   372236           
  Partials                  ?       73           

Flag	Coverage Δ
MdeModulePkg	1.55% <ø> (?)
MdePkg	5.46% <ø> (?)
NetworkPkg	0.55% <ø> (?)
PolicyServicePkg	30.42% <ø> (?)
UefiCpuPkg	4.92% <ø> (?)
UnitTestFrameworkPkg	11.40% <ø> (?)

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