README: add libtool and pkg-config to local build packages
README: add libtool and pkg-config to local build packages

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