fixup! vcpkg: get MSVC dependencies with vcpkg rather than nuget

We also have to copy the .dll files into t/helper/ so that the .exe
files in that directory work correctly.

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>

compat/vcbuild/vcpkg_copy_dlls.bat

@@ -33,4 +33,7 @@ REM ================================================================
 	xcopy /e/s/v/y %inst%\bin\*.dll ..\..\
 	xcopy /e/s/v/y %inst%\bin\*.pdb ..\..\
 
+	xcopy /e/s/v/y %inst%\bin\*.dll ..\..\t\helper\
+	xcopy /e/s/v/y %inst%\bin\*.pdb ..\..\t\helper\
+
 	EXIT /B 0