File busybox-mingw-headers-9-compile-fix.patch of Package mingw32-busybox

--- a/win32/poll.h        2021-07-06 22:04:42.664985520 +0000
+++ b/win32/poll.h        2021-07-06 22:05:21.888985805 +0000
@@ -22,6 +22,10 @@
 #ifndef _GL_POLL_H
 #define _GL_POLL_H
 
+typedef unsigned long nfds_t;
+
+#ifndef __MINGW32__
+
 /* fake a poll(2) environment */
 #define POLLIN      0x0001      /* any readable data available   */
 #define POLLPRI     0x0002      /* OOB/Urgent readable data      */
@@ -41,7 +45,6 @@
   short revents;                /* events found on return        */
 };
 
-typedef unsigned long nfds_t;
 
 extern int poll (struct pollfd *pfd, nfds_t nfd, int timeout);
 
@@ -49,5 +52,6 @@
 #if !defined (_POSIX_C_SOURCE) && !defined (_XOPEN_SOURCE)
 #define INFTIM (-1)
 #endif
+#endif
 
 #endif /* _GL_POLL_H */