5.3: Fix python/pip installation on macOS

Author: MaxDesiatov

utils/webassembly/macos/install-dependencies.sh

@@ -2,10 +2,15 @@
 
 set -ex
 
-if [ -n "$(brew list | grep python@2)" ]; then
-  brew uninstall $(brew list | grep python@2)
+if ! command -v pip &> /dev/null
+then
+  PIP_COMMAND=pip3
+else
+  PIP_COMMAND=pip
 fi
 
+$PIP_COMMAND install six
+
 brew install cmake ninja llvm sccache
 
 # Install latest wasmer