Update REDasm to version 2.1.1, most important changes:

• Dropped QtWebEngine for native graph rendering
• Improved analysis speed and reliability Improved string detection and RTTI analysis
• Improved rendering performance
• Preliminary AVR8 assembler implementation
• Fixed crashes and undefined behaviors on ARM
• Better 32-bit OS support (work in progress)

While here, drop CMAKE_INSTALL_RPATH work-around, it is
actually not needed.