Quote variable expansions in dotnet-install.sh
Quote variable expansions in dotnet-install.sh

Fix #5281 to prevent paths with spaces from causing problems due to word
splitting.

harshjain2/cli,dasMulli/cli,dasMulli/cli,johnbeisner/cli,johnbeisner/cli,ravimeda/cli,ravimeda/cli,ravimeda/cli,johnbeisner/cli,svick/cli,livarcocc/cli-1,harshjain2/cli,svick/cli,harshjain2/cli,livarcocc/cli-1,dasMulli/cli,svick/cli,livarcocc/cli-1