add support for remote upload on Yun shield

platform.txt

@@ -113,6 +113,7 @@ tools.avrdude.bootloader.params.verbose=-v
 tools.avrdude.bootloader.params.quiet=-q -q
 tools.avrdude.bootloader.pattern="{cmd.path}" "-C{config.path}" {bootloader.verbose} -p{build.mcu} -c{protocol} {program.extra_params} "-Uflash:w:{runtime.platform.path}/bootloaders/{bootloader.file}:i" -Ulock:w:{bootloader.lock_bits}:m
 
+tools.avrdude_remote.upload.pattern=/usr/bin/run-avrdude /tmp/sketch.hex {upload.verbose} -p{build.mcu}
 
 # USB Default Flags
 # Default blank usb manufacturer will be filled in at compile time