fixup! mingw: allow compiling with GCC 8 and DEVELOPER=1

It is actually illegal to case between function and data pointers, and
it is fascinating that GCC allows that, but MSVC complains about that
when we let it be strict.

Signed-off-by: Johannes Schindelin <[email protected]>

Author: dscho

compat/poll/poll.c

@@ -149,7 +149,7 @@ win32_compute_revents (HANDLE h, int *p_sought)
     case FILE_TYPE_PIPE:
       if (!once_only)
 	{
-	  NtQueryInformationFile = (PNtQueryInformationFile)(void *)
+	  NtQueryInformationFile = (PNtQueryInformationFile)(void (*)(void))
 	    GetProcAddress (GetModuleHandleA ("ntdll.dll"),
 			    "NtQueryInformationFile");
 	  once_only = TRUE;