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/buspirate_spi.c b/buspirate_spi.c
index d2ebc75..9d229f4 100644
--- a/buspirate_spi.c
+++ b/buspirate_spi.c
@@ -286,7 +286,7 @@
 		/* The Bus Pirate can't handle UART input buffer overflow in BBIO mode, and sending a sequence
 		 * of 0x00 too fast apparently triggers such an UART input buffer overflow.
 		 */
-		usleep(10000);
+		internal_sleep(10000);
 	}
 	/* We know that 20 commands of \0 should elicit at least one BBIO1 response. */
 	if ((ret = buspirate_wait_for_string(bp_commbuf, "BBIO")))