[PATCH 0/5] fork/exec removal series

Here is a series of patches that removes a number fork/exec pairs. They are replaced by delegating to start_command/finish_command/run_command. You can regard this as the beginning of the MinGW port integration.

There still remain a few forks, which fall into these categories:

- They are in tools or code that are not (yet) ported to MinGW.[*]

- The fork()s are not followed by exec(). These need a different
  implementation. I am thinking of a start_coroutine()/finish_coroutine()
  API that is implemented with threads in MinGW. (Suggestions of a better
  as well as implementations are welcome.)

- The upload-pack case calls for an entirely different solution.

[*] Just this weekend Mike Pape ported git-daemon, but I didn't find the time to have it integrated in this series - if that were possible at all.

Patch 2 depends on Patch 1; otherwise, there are no dependencies. The series goes on top of next (it touches str_buf stuff in connect.c).

 builtin-archive.c    |    8 +--
 builtin-fetch-pack.c |   63 ++++++++-----------------
 cache.h              |    4 +-
 connect.c            |  126 ++++++++++++++++++++++++--------------------------
 convert.c            |   36 ++++----------
 diff.c               |   38 +--------------
 peek-remote.c        |    8 +--
 send-pack.c          |    8 +--
 transport.c          |    9 +---
 9 files changed, 106 insertions(+), 194 deletions(-)

-- Hannes