Allow using inherited RUSTUP_UPDATE_ROOT variable in rustup-init.sh. #1495
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This also makes the usage of the variable consistent with rust version by moving the "/dist" part to usage site.
For people in mainland China, Amazon web hosting and cdn services are inaccessible. Using this patch, we can set the
RUSTUP_UPDATE_ROOT
variable beforehand to askrustup-init.sh
to download rustup-init.exe from a mirror site.