Fix mac CI (#2439)

tools/mac_setup.sh

@@ -4,9 +4,6 @@
 if [[ $(command -v brew) == "" ]]; then
   echo "Installing Hombrew"
   /bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install.sh)"
-else
-    echo "Updating Homebrew"
-    brew update || true
 fi
 
 brew install capnp \
@@ -22,33 +19,23 @@ brew install capnp \
              qt5 \
              zeromq
 
-# Detect shell and pick correct RC file.
 if [[ $SHELL == "/bin/zsh" ]]; then
   RC_FILE="$HOME/.zshrc"
 elif [[ $SHELL == "/bin/bash" ]]; then
   RC_FILE="$HOME/.bash_profile"
-else
-  echo "-------------------------------------------------------------"
-  echo "Unsupported shell: \"$SHELL\", cannot install to RC file."
-  echo "Please run: echo \"source $OP_DIR/tools/openpilot_env.sh\" >> %YOUR SHELL's RC file%"
-  echo "-------------------------------------------------------------"
 fi
 
-# Install to RC file (only non-CI).
 if [ -z "$OPENPILOT_ENV" ] && [ -n "$RC_FILE" ] && [ -z "$CI" ]; then
   OP_DIR=$(git rev-parse --show-toplevel)
   echo "source $OP_DIR/tools/openpilot_env.sh" >> $RC_FILE
   source $RC_FILE
   echo "Added openpilot_env to RC file: $RC_FILE"
-else
-  echo "Skipped RC file installation"
 fi
 
-# Install python.
 pyenv install -s 3.8.2
 pyenv global 3.8.2
 pyenv rehash
-eval "$(pyenv init -)" # CI doesn't use .bash_profile, and will use python2.7 if this line isn't here.
+eval "$(pyenv init -)"
 
 pip install pipenv==2020.8.13
 pipenv install --system --deploy