Caused a clean 'make PythonTest_pyuno_pytests_ssl' to fail for me with
".../instdir/program/python.exe: No such file or directory" as the above
apparently expands to nothing at the time
solenv/gbuild/platform/com_MSC_class.mk is read.

Change-Id: I33ad8d8d0876dcec9b9cb02b71a9399d959cf660