bit_set.h: forward declare fmt_unveil

This change is necessary to fix the following clangd error in `StrFmt.h`

Redefinition of 'fmt_unveil'clang(redefinition)
bit_set.h(388, 8): Previous definition is here

Utilities/bit_set.h

@@ -23,7 +23,6 @@ Intersection (&) and symmetric difference (^) is also available.
 
 #include "util/types.hpp"
 #include "util/atomic.hpp"
-#include "Utilities/StrFmt.h"
 
 template <typename T>
 concept BitSetEnum = std::is_enum_v<T> && requires(T x)
@@ -384,6 +383,9 @@ public:
 	}
 };
 
+template <typename T>
+struct fmt_unveil;
+
 template <typename T>
 struct fmt_unveil<bs_t<T>>
 {

rpcs3/Crypto/utils.cpp

@@ -12,6 +12,7 @@
 #include <cstring>
 #include <cstdio>
 #include <ctime>
+#include "Utilities/StrFmt.h"
 #include "Utilities/StrUtil.h"
 #include "Utilities/File.h"