include: Fix the C_ASSERT macro to not generate an unused variable warning when compiling with gcc.

[Robert Shearman]

Provide a fallback case for other compilers to avoid C_ASSERT being 
undefined and causing an error.
---
  include/winnt.h |    4 +++-
  1 files changed, 3 insertions(+), 1 deletions(-)

Resend using Alexandre's suggestion of not using the MSVC way for the 
gcc case.
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