Fix missing intrinsic when included from C++/CLI
Managed C++ code doesn't have the _BitScanReverse* intrinsics, we must use the fallback code for count_digits etc.
diff --git a/fmt/format.h b/fmt/format.h
index 58b416b..2f1c518 100644
--- a/fmt/format.h
+++ b/fmt/format.h
@@ -289,7 +289,7 @@
// otherwise support __builtin_clz and __builtin_clzll, so
// only define FMT_BUILTIN_CLZ using the MSVC intrinsics
// if the clz and clzll builtins are not available.
-#if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL)
+#if FMT_MSC_VER && !defined(FMT_BUILTIN_CLZLL) && !defined(_MANAGED)
# include <intrin.h> // _BitScanReverse, _BitScanReverse64
namespace fmt {
