Don't use 128 bit integers with clang-cl (#1800)

clang-cl currently has a long-standing bug that using 128 bit integers
generates references to symbols that are provided neither by its own nor
by the Microsoft runtime: https://bugs.llvm.org/show_bug.cgi?id=25305

include/fmt/core.h

@@ -299,7 +299,7 @@ template <typename T> struct std_string_view {};
 
 #ifdef FMT_USE_INT128
 // Do nothing.
-#elif defined(__SIZEOF_INT128__) && !FMT_NVCC
+#elif defined(__SIZEOF_INT128__) && !FMT_NVCC && !(FMT_CLANG_VERSION && FMT_MSC_VER)
 #  define FMT_USE_INT128 1
 using int128_t = __int128_t;
 using uint128_t = __uint128_t;