symlink fix

Author: brentru

build_platform.py

@@ -286,7 +286,7 @@ def run_or_die(cmd, error):
 # link our library folder to the arduino libraries folder
 if not IS_LEARNING_SYS:
     try:
-        os.symlink(BUILD_DIR, '/Users/brentrubell/Documents/Arduino/libraries' + os.path.basename(BUILD_DIR))
+        os.symlink(BUILD_DIR, os.environ['HOME']+'/Arduino/libraries/' + os.path.basename(BUILD_DIR))
     except FileExistsError:
         pass