sdcc: upgrade to 3.6.0
sdcc: upgrade to 3.6.0

litex-hub/litex-conda-prog,timvideos/conda-hdmi2usb-packages,litex-hub/litex-conda-eda,SymbiFlow/conda-packages,timvideos/conda-misoc-lm32,timvideos/conda-hdmi2usb-packages,litex-hub/litex-conda-compilers,SymbiFlow/conda-packages,timvideos/conda-misoc-lm32