vendor the compiler toolchain (#2342)

setup.sh

@@ -8,8 +8,8 @@ PLATFORM=$(uname -s)
 
 echo "installing dependencies"
 if [[ $PLATFORM == "Darwin" ]]; then
-  export HOMEBREW_NO_AUTO_UPDATE=1
-  brew install --cask gcc-arm-embedded
+  # pass
+  :
 elif [[ $PLATFORM == "Linux" ]]; then
   # for AGNOS since we clear the apt lists
   if [[ ! -d /"var/lib/apt/" ]]; then
@@ -18,9 +18,8 @@ elif [[ $PLATFORM == "Linux" ]]; then
 
   sudo apt-get install -y --no-install-recommends \
     curl ca-certificates \
-    make g++ git libnewlib-arm-none-eabi \
+    make g++ git \
     libusb-1.0-0 \
-    gcc-arm-none-eabi \
     python3-dev python3-pip python3-venv
 else
   echo "WARNING: unsupported platform. skipping apt/brew install."