manual_winbuild: update the PowerShell script [Windows]

devtools/windows/manual_winbuild.ps1

@@ -19,7 +19,7 @@ $QT_MSVC_DIR = "C:/Qt/6.2.4/msvc2019_64"
 $QTCMake_DIR = "$QT_MSVC_DIR/lib/cmake"
 
 # change the system PATH temporarily (needed for tests)
-$PY_PLATFORM = "C:/multipython/Python310"
+$PY_PLATFORM = "C:/opt/multipython/Python310"
 $Env:Path = "$QT_MSVC_DIR/bin;$PY_PLATFORM;$Env:Path"
 $BUILD_DIR = "build"
 
@@ -47,6 +47,7 @@ cmake -G "Visual Studio 17 2022" -A x64 -T host=x64 -DLIB_MAN=OFF `
     -DQTDIR="$QT_MSVC_DIR" `
     -DFFTW3_INCLUDE_DIR="$FFTW3_INCLUDE_DIR" -DFFTW3_LIBRARY="$FFTW3_LIB" `
     -DCMAKE_INCLUDE_PATH="$OPT_DIR/include;$BOOST_INCLUDE_DIR" -DCMAKE_LIBRARY_PATH="$OPT_DIR/lib;$BOOST_LIB_DIR" `
+    -DBA_PY_PACKAGE=ON `
     -DCMAKE_C_COMPILER="cl.exe" -DCMAKE_CXX_COMPILER="cl.exe" `
     -B. ..