fwd: Mark __MCF_runtime_failure() noexcept

(cherry picked from commit 8424c61)
Signed-off-by: LIU Hao <[email protected]>

mcfgthread/fwd.h

@@ -169,6 +169,10 @@ template<> struct __MCF_static_assert<true> { };
 /* The `__MCF_ASSERT()` and `__MCF_CHECK()` macros perform run-time checks. If
  * an argument yields false, `__MCF_ASSERT()` results in undefined behavior,
  * and `__MCF_CHECK()` effects abnormal termination of the current program.  */
+__MCF_FWD_IMPORT __MCF_NEVER_RETURN __MCF_NEVER_INLINE __MCF_FN_COLD
+void
+__MCF_runtime_failure(const char* __where) __MCF_noexcept;
+
 #define __MCF_ASSERT(...)    ((__VA_ARGS__) ? (void) 0 : __MCF_UNREACHABLE)
 #define __MCF_CHECK(...)    ((__VA_ARGS__) ? (void) 0 : __MCF_runtime_failure(__MCF_EX __func__))
 
@@ -270,9 +274,5 @@ size_t
 _MCF_maxz(size_t __x, size_t __y) __MCF_noexcept
   { return (__x < __y) ? __y : __x;  }
 
-__MCF_FWD_IMPORT __MCF_NEVER_RETURN __MCF_NEVER_INLINE __MCF_FN_COLD
-void
-__MCF_runtime_failure(const char* __where);
-
 __MCF_CXX(})  /* extern "C"  */
 #endif  /* __MCFGTHREAD_FWD_  */