fix zlip, bzip2 and freetype building. other misc bugs

[ITotalJustice]

upgrades: zlib 1.2.11 -> 1.2.13 libpng 1.5.10 -> 1.5.30 bzip2 1.0.6 -> 1.0.8 freetype 2.10.4 -> 2.12.1

fixes:

• updated broke zlib url
• bzip2 was detecting system installed libs (harfbuzz and brotli) so i disabled them
• add back ntfs lib
• iso9660.c was checking if a bool was negative...
• iso9660.c was using strnicmp instead of strncasecmp