meson: improve PATH handling

When locating programs required for the build we give some special treatment to Windows systems so that we know to also look up tools provided by a Git for Windows installation. This ensures that the build doesn't have any prerequisites other than Microsoft Visual Studio, Meson and Git for Windows. Consequently, some of the programs returned by `find_program()` may not be found via PATH, but via these extra directories. But while Meson can use these tools directly without any special treatment, any scripts that we execute may not be able to find those programs. To help them we thus prepend the directories of a subset of the found programs to PATH. This doesn't make much sense though: we don't need to prepend PATH for any program that was found via PATH, but we really only need to do so for programs located via the extraneous Windows-specific paths. So instead of prepending all programs paths, we really only need to prepend the Windows-specific paths. Adapt the code accordingly by only prepeding Windows-specific paths to PATH, which both simplifies the code and clarifies intent. Signed-off-by: Patrick Steinhardt <ps@pks.im> Signed-off-by: Junio C Hamano <gitster@pobox.com>