Fix quoting in build.sh (#19570)

This allows it to accept arguments that contain spaces, such as
propreties like "/p:OfficialBuilder=Foo Bar".

Fixes the regression introduced in #19211

Author: omajid

build.sh

@@ -13,4 +13,4 @@ while [[ -h $source ]]; do
 done
 
 scriptroot="$( cd -P "$( dirname "$source" )" && pwd )"
-"$scriptroot/eng/build.sh" --restore --build $@
+"$scriptroot/eng/build.sh" --restore --build "$@"