config: update with dummy toolchain
    
    - new config options:
      - GCC_PLUGINS=y
      - GCC_PLUGIN_CYC_COMPLEXITY is not set
      - GCC_PLUGIN_LATENT_ENTROPY is not set
      - GCC_PLUGIN_RANDSTRUCT is not set
      - GCC_PLUGIN_STRUCTLEAK_USER is not set
      - GCC_PLUGIN_STRUCTLEAK_BYREF is not set
      - GCC_PLUGIN_STRUCTLEAK_BYREF_ALL is not set