Update _MSC_VER equality checks for msdiaNNN.dll

Use inequality instead of equality to defend against minor version
increases in _MSC_VER. An _MSC_VER value of 1901 should still use
msdia140.dll, as described in this blog post:
https://blogs.msdn.microsoft.com/vcblog/2016/10/05/visual-c-compiler-version/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@284058 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed