msvcrt: Create/use private heap.

[Markus Amsler]

This improves Battlefield 1942 in game menu response time considerably 
(a lot of new/free calls). Native msvcrt uses also an private heap.
---
  dlls/msvcrt/data.c    |   24 ++++++++++++------------
  dlls/msvcrt/environ.c |    8 ++++----
  dlls/msvcrt/heap.c    |   24 ++++++++++++------------
  dlls/msvcrt/main.c    |   15 ++++++++++-----
  dlls/msvcrt/msvcrt.h  |    1 +
  dlls/msvcrt/process.c |    4 ++--
  dlls/msvcrt/scanf.h   |    4 ++--
  dlls/msvcrt/thread.c  |    2 +-
  dlls/msvcrt/wcs.c     |   12 ++++++------
  9 files changed, 50 insertions(+), 44 deletions(-)
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