kernel32: Fix the GetComputerName* functions to not write to the buffer at all if there is not enough space.

[Robert Shearman]

Add tests for the GetComputerName* functions that show this issue.

Fix an off-by-one error in setting the size when there is not enough space.

Remove the exception handlers for GetComputerNameW, 
GetComputerNameExA/W, since testing on XP SP2 shows that access 
violations are not caught and these are not present on Win9x, which does 
have an exception handler.
---
  dlls/kernel32/computername.c  |  100 +++++++++++--------------------
  dlls/kernel32/tests/environ.c |  131 
+++++++++++++++++++++++++++++++++++++++++
  2 files changed, 166 insertions(+), 65 deletions(-)
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