Security update for rust

This update for rust fixes the following issues:

- CVE-2018-1000622: rustdoc loads plugins from world writable directory allowing for arbitrary code execution
This patch consists of requiring `--plugin-path` to be passed whenever `--plugin` is passed
Note that rustdoc plugins will be removed entirely on 1.28.0 (bsc#1100691).

This update was imported from the SUSE:SLE-15:Update update project.

Fixed bugs
bnc#1100691
VUL-0: CVE-2018-1000622 rust: rustdoc loads plugins from world writable directory allowing for arbitrary code execution
Selected Binaries
openSUSE Build Service is sponsored by