Fixed "runtime.hardware.path" and "runtime.platform.path" values

"runtime.hardware.path" now contains the path to the hardware folder
of the currently selected board and "runtime.platform.path" the path
to the specific platform.

This should fix #1176 and #1761.

Author: cmaglie

arduino/avr/platform.txt

@@ -84,7 +84,7 @@ tools.avrdude.erase.pattern="{cmd.path}" "-C{config.path}" {erase.verbose} -p{bu
 
 tools.avrdude.bootloader.params.verbose=-v -v -v -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.ide.path}/hardware/arduino/avr/bootloaders/{bootloader.file}:i" -Ulock:w:{bootloader.lock_bits}:m
+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
 
 
 # USB Default Flags