When targeting arm64ec, neither KMP_ARCH_X86_64 nor KMP_ARCH_AARCH64 is defined. This fixes a compilation warning when building openmp for mingw/arm64ec.
When targeting arm64ec, neither KMP_ARCH_X86_64 nor KMP_ARCH_AARCH64 is defined. This fixes a compilation warning when building openmp for mingw/arm64ec.