[PATCH 1/7] CMD : Correct support for cmd.exe /C string [bug 21927]

[Jason Edmeades]

The cmd.exe help is very explicit in when the new behaviour relating to
the removing of quotes when cmd.exe /C is used, and if any of them fail
then the behaviour reverts back to the old method, which is equivalent
to /S. This patch corrects that behaviour in that it enforces at least
one space, plus that the thing in quotes is an executable.

Note1: Tested manually on windows with procmon, windows does indeed do
the same as this patch, ie a double path/pathext search.

Note2: Tests in the patch are not good. This is because the only extra
tests you can execute rely on the ability to have an executable which
returns a specific string AND is identifiable as an executable. All
exe's under wine are dummy ones created in the build - you cant copy
e.g. cmd.exe to fred.exe and then launch it.
---
 programs/cmd/batch.c                     |    2 +-
 programs/cmd/tests/test_builtins.cmd     |    4 ++
 programs/cmd/tests/test_builtins.cmd.exp |    2 +
 programs/cmd/wcmd.h                      |    2 +-
 programs/cmd/wcmdmain.c                  |   59 +++++++++++++++++++-----------
 5 files changed, 45 insertions(+), 24 deletions(-)

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