Add support for Bus Pirate as a JTAG adapter.

This includes a driver and matching config file.  This support needs to be
enabled through the initial "configure" (use "--enable-buspirate").

Signed-off-by: Michal Demin <michaldemin@gmail.com>
Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/jtag/interfaces.c

@@ -91,6 +91,9 @@ extern struct jtag_interface rlink_interface;
 #if BUILD_ARMJTAGEW == 1
 extern struct jtag_interface armjtagew_interface;
 #endif
+#if BUILD_BUSPIRATE == 1
+extern struct jtag_interface buspirate_interface;
+#endif
 #endif // standard drivers
 
 /**
@@ -151,6 +154,9 @@ struct jtag_interface *jtag_interfaces[] = {
 #if BUILD_ARMJTAGEW == 1
 		&armjtagew_interface,
 #endif
+#if BUILD_BUSPIRATE == 1
+		&buspirate_interface,
+#endif
 #endif // standard drivers
 		NULL,
 	};