Remove INI settings from stripped modules

[pronskiy]

Several INI settings remain from modules that were stripped in Phase 1. They are registered but do nothing:

• xdebug.output_dir / php_debugger.output_dir — was for profiler/trace output
• xdebug.use_compression / php_debugger.use_compression — was for trace compression
• xdebug.file_link_format / php_debugger.file_link_format — was for develop mode
• xdebug.filename_format / php_debugger.filename_format — was for develop mode

What to do

1. Remove the STD_PHP_INI_ENTRY lines for these settings in xdebug.c (both xdebug.* and php_debugger.* blocks)
2. Remove the corresponding struct members in the globals if unused elsewhere
3. Run make — should compile cleanly
4. Run the test suite — no new failures

Acceptance criteria

• Dead INI settings removed from both prefix blocks
• Extension builds cleanly
• phpinfo() no longer shows these settings
• Test suite: no new failures