OpenULINK firmware: change .lnk file extension to .lk in "make clean"

Recent versions of SDCC generate .lk files instead of .lnk - change the
OpenULINK Makefile "clean" target and top level .gitignore file to reflect
this.

Change-Id: I36f38638b712b962498c69c362f123378e1aa045
Signed-off-by: Martin Schmölzer <martin.schmoelzer@student.tuwien.ac.at>
Reviewed-on: http://openocd.zylin.com/1485
Tested-by: jenkins
Reviewed-by: Spencer Oliver <spen@spen-soft.co.uk>

.gitignore

@@ -21,7 +21,7 @@ src/jtag/drivers/OpenULINK/*.lst
 src/jtag/drivers/OpenULINK/*.sym
 src/jtag/drivers/OpenULINK/*.map
 src/jtag/drivers/OpenULINK/*.mem
-src/jtag/drivers/OpenULINK/*.lnk
+src/jtag/drivers/OpenULINK/*.lk
 src/jtag/drivers/OpenULINK/*.ihx
 src/jtag/drivers/OpenULINK/*.rst
 

src/jtag/drivers/OpenULINK/Makefile

@@ -83,7 +83,7 @@ ulink_firmware.ihx: $(OBJECTS)
 	$(AS) -lsgo $@ $<
 
 clean:
-	rm -f *.asm *.lst *.rel *.rst *.sym *.ihx *.lnk *.map *.mem
+	rm -f *.asm *.lst *.rel *.rst *.sym *.ihx *.lk *.map *.mem
 
 hex: ulink_firmware.ihx
 	$(PACKIHX) ulink_firmware.ihx > ulink_firmware.hex