Addressing warning message when using Python 3.10

[rickybalin]

When I use Python 3.10, the following line of code

dpcpp-llvm-spirv/pkg/dpcpp_llvm_spirv/_helper.py

Line 16 in f5e58c2

if platform.system() is "Windows":

produces the following warning message

SyntaxWarning: "is" with a literal. Did you mean "=="?
  if platform.system() is "Windows":

Could this please be addressed?

Thanks!