Adjust Windows DLL search path for Python 3.8+ #1530

Job	Run time
Build (Linux_GCC_9_Python37, ubuntu-20.04, gcc, 9, 3.7, -DMATERIALX_BUILD_SHARED_LIBS=ON)	15m 43s
Build (Linux_GCC_11_Python39, ubuntu-20.04, gcc, 11, 3.9, ON)	24m 1s
Build (Linux_GCC_12_Python39, ubuntu-22.04, gcc, 12, 3.9, ON)	14m 33s
Build (Linux_Clang_10_Python37, ubuntu-20.04, clang, 10, 3.7, -DMATERIALX_BUILD_SHARED_LIBS=ON, ON)	15m 14s
Build (Linux_Clang_13_Python39, ubuntu-22.04, clang, 13, 3.9, ON)	19m 39s
Build (Linux_Clang_14_Python39, ubuntu-22.04, clang, 14, 3.9, -DMATERIALX_DYNAMIC_ANALYSIS=ON, ON...	24m 5s
Build (MacOS_Xcode_11_Python37, macos-11, xcode, 11.7, -DMATERIALX_BUILD_SHARED_LIBS=ON, 3.7)	30m 34s
Build (MacOS_Xcode_13_Python39, macos-12, xcode, 13.4, 3.9)	28m 33s
Build (MacOS_Xcode_14_Python39, macos-12, xcode, 14.2, 3.9, ON)	24m 43s
Build (Windows_VS2019_Win32_Python27, windows-2019, x86, 2.7, -G "Visual Studio 16 2019" -A "Win3...	1m 1s
Build (Windows_VS2019_x64_Python38, windows-2019, x64, 3.8, -G "Visual Studio 16 2019" -A "x64")	19m 17s
Build (Windows_VS2022_x64_Python39, windows-2022, x64, 3.9, -G "Visual Studio 17 2022" -A "x64", ON)	18m 43s
	3h 56m 6s

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