Make 'flash' target a bit more generic and drop absolute paths.

example/Makefile

@@ -72,13 +72,12 @@ clean:
 	$(Q)rm -f $(BINARY).list
 
 flash:
-	$(Q)$(OPENOCD) \
-		-f /usr/share/openocd/scripts/interface/jtagkey-tiny.cfg \
-		-f /usr/share/openocd/scripts/board/olimex_stm32_h103.cfg \
-		-c "init" -c "reset halt" \
-		-c "flash write_image erase blink.bin 0x08000000" \
-		-c "resume 0x08000000" \
-		-c "shutdown"
+	$(Q)$(OPENOCD) -f interface/jtagkey-tiny.cfg \
+		       -f board/olimex_stm32_h103.cfg \
+		       -c "init" -c "reset halt" \
+		       -c "flash write_image erase $(BINARY).bin 0x08000000" \
+		       -c "resume 0x08000000" \
+		       -c "shutdown"
 
 .PHONY: images clean