Usleep() is not found in all versions of MinGW, use Sleep() on Windows

Handle long sleeps on non-Windows correctly.

Corresponding to flashrom svn r1667.

Signed-off-by: Maksim Kuleshov <mmcx@mail.ru>
Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/programmer.h b/programmer.h
index a22bdd2..2ea7b48 100644
--- a/programmer.h
+++ b/programmer.h
@@ -250,6 +250,7 @@
 /* udelay.c */
 void myusec_delay(int usecs);
 void myusec_calibrate_delay(void);
+void internal_sleep(int usecs);
 void internal_delay(int usecs);
 
 #if CONFIG_INTERNAL == 1