[2/4] ntdll: add support for the HEAP_FREE_CHECKING_ENABLED style of heap overrun detection.

[Dan Kegel]

This is a cheap way to look for overruns; it doesn't require
any extra allocations, and it seems to find overrun problems
in eight tests (as of yesterday):
  advpack_test.exe.so files.c
  gdi32_test.exe.so path.c
  kernel32_test.exe.so format_msg.c
  msi_test.exe.so automation.c
  netapi32_test.exe.so access.c
  ole32_test.exe.so moniker.c
  oleaut32_test.exe.so tmarshal.c
  oleaut32_test.exe.so usrmarshal.c
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