message: Update build_win32.bat
  quotes for QT path
  fixed Makefile filename for build_libs
  get VS tools version from env variables
diff: set VS_PATH="C:\Program Files (x86)\Microsoft Visual Studio\2019\Community"
  -set QT_PATH=C:\Qt\5.15.2\msvc2019
  +set QT_PATH="C:\Qt\5.15.2\msvc2019"
  set SEVENZIP_PATH="C:\Program Files\7-Zip"
  set BUILD_NAME=die_win32_portable
  @@ -32,7 +32,7 @@ rmdir /s /q %SOURCE_PATH%\gui_source\release
  cd build_libs
  %QT_PATH%\bin\qmake.exe build_libs.pro -r -spec win32-msvc "CONFIG+=release"
  -nmake Makefile.Release clean
  +nmake Makefile clean
  nmake
  del Makefile
  del Makefile.Release
  @@ -83,9 +83,9 @@ copy %QT_PATH%\plugins\imageformats\qtiff.dll %SOURCE_PATH%\release\%BUILD_NAME%
  copy %QT_PATH%\plugins\imageformats\qico.dll %SOURCE_PATH%\release\%BUILD_NAME%\imageformats\
  copy %QT_PATH%\plugins\imageformats\qgif.dll %SOURCE_PATH%\release\%BUILD_NAME%\imageformats\
  -copy %VS_PATH%\VC\Redist\MSVC\14.27.29016\x86\Microsoft.VC142.CRT\msvcp140.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  -copy %VS_PATH%\VC\Redist\MSVC\14.27.29016\x86\Microsoft.VC142.CRT\vcruntime140.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  -copy %VS_PATH%\VC\Redist\MSVC\14.27.29016\x86\Microsoft.VC142.CRT\msvcp140_1.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  +copy %VS_PATH%\VC\Redist\MSVC\%VCToolsVersion%\x86\Microsoft.VC142.CRT\msvcp140.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  +copy %VS_PATH%\VC\Redist\MSVC\%VCToolsVersion%\x86\Microsoft.VC142.CRT\vcruntime140.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  +copy %VS_PATH%\VC\Redist\MSVC\%VCToolsVersion%\x86\Microsoft.VC142.CRT\msvcp140_1.dll %SOURCE_PATH%\release\%BUILD_NAME%\
  xcopy %SOURCE_PATH%\XStyles\qss %SOURCE_PATH%\release\%BUILD_NAME%\qss /E /I
  xcopy %SOURCE_PATH%\Detect-It-Easy\db %SOURCE_PATH%\release\%BUILD_NAME%\db /E /I
  