Drop the empty exception declaration from CheckError

The function is defined as follows:

    namespace _com_util {
      inline void CheckError(HRESULT hr) throw() {
        if(FAILED(hr)) { _com_issue_error(hr); }
      }
    }

but _com_issue_error is defined as:

    inline void _com_issue_error(HRESULT hr) {
    #if __EXCEPTIONS
        throw _com_error(hr);
    #else
        /* This is designed to use exceptions. If exceptions are disabled, there is not much we can do here. */
        __debugbreak();
    #endif
    }

so actually calling it with a failed HRESULT crashes the program. I
think the empty exception specification should simply be dropped.

See https://bugs.debian.org/816427

Reported-by: Sam Morris <sam@robots.org.uk>
Signed-off-by: Stephen Kitt <steve@sk2.org>
Signed-off-by: Liu Hao <lh_mouse@126.com>

mingw-w64-headers/include/comutil.h

diff --git a/mingw-w64-headers/include/comutil.h b/mingw-w64-headers/include/comutil.h
index f6d7adc..e090067 100644
--- a/mingw-w64-headers/include/comutil.h
+++ b/mingw-w64-headers/include/comutil.h
@@ -44,7 +44,7 @@
 class _variant_t;
 
 namespace _com_util {
-  inline void CheckError(HRESULT hr) throw() {
+  inline void CheckError(HRESULT hr) {
     if(FAILED(hr)) { _com_issue_error(hr); }
   }
 }