ROMFS: purge old mixing system

- SYS_USE_IO is now off by default (enabled by default per board)

Tools/px_romfs_pruner.py

@@ -105,18 +105,10 @@ def main():
                     # find excluded boards
                     if re.search(r'\b{0} exclude\b'.format(args.board), line):
                         board_excluded = True
-                    # handle mixer files differently than startup files
-                    if file_path.endswith(".mix"):
-                        if line.startswith(("Z:", "M:", "R: ", "O:", "S:",
-                                            "H:", "T:", "P:", "A:")):
-                            # reduce multiple consecutive spaces into a
-                            # single space
-                            line_reduced = re.sub(' +', ' ', line)
-                            pruned_content += line_reduced
-                    else:
-                        if not line.isspace() \
-                                and not line.strip().startswith("#"):
-                            pruned_content += line.strip() + "\n"
+
+                    if not line.isspace() \
+                            and not line.strip().startswith("#"):
+                        pruned_content += line.strip() + "\n"
             # delete the file if it doesn't contain the architecture
             # write out the pruned content else
             if not board_excluded:

Tools/run-shellcheck.sh

@@ -14,7 +14,7 @@ search_directory="$1"
 command -v shellcheck >/dev/null 2>&1 || { echo -e >&2 \
 "Error: shellcheck required but it's not installed. On Ubuntu use:\n sudo apt-get install shellcheck\n\nAborting."; exit 1; }
 
-scripts="$(find "$search_directory" -type f ! -name '*.txt' ! -name '*.mix' ! -name '*.bin')"
+scripts="$(find "$search_directory" -type f ! -name '*.txt' ! -name '*.bin')"
 
 echo "Running shellcheck in '$search_directory'."