fix(@angular/cli): command runner is not working on windows
fix(@angular/cli): command runner is not working on windows

`fs` is unable to read the normalized paths from `@angular-devkit/core`  on `windows` as the disk drive is replaced from `c:/` to `/c/`

Closes #11928

clydin/angular-cli,geofffilippi/angular-cli,angular/angular-cli,angular/angular-cli,angular/angular-cli,ocombe/angular-cli,beeman/angular-cli,geofffilippi/angular-cli,Brocco/angular-cli,manekinekko/angular-cli,geofffilippi/angular-cli,beeman/angular-cli,catull/angular-cli,clydin/angular-cli,Brocco/angular-cli,filipesilva/angular-cli,filipesilva/angular-cli,catull/angular-cli,Brocco/angular-cli,beeman/angular-cli,Brocco/angular-cli,catull/angular-cli,DevIntent/angular-cli,DevIntent/angular-cli,hansl/angular-cli,ocombe/angular-cli,catull/angular-cli,angular/angular-cli,clydin/angular-cli,manekinekko/angular-cli,filipesilva/angular-cli,hansl/angular-cli,Brocco/angular-cli,ocombe/angular-cli,hansl/angular-cli,hansl/angular-cli,DevIntent/angular-cli,beeman/angular-cli,DevIntent/angular-cli,DevIntent/angular-cli,ocombe/angular-cli,geofffilippi/angular-cli,ocombe/angular-cli,filipesilva/angular-cli,clydin/angular-cli,manekinekko/angular-cli