src/poky:rust: oe-selftest issue fix with v1.82

A new feature "Link std statically in rustc_driver" was introduced
in rust_1.82 [https://github.com/rust-lang/rust/pull/122362],and
which is causing the below failure in oe-selftest.

Running unittests src/main.rs (build/x86_64-unknown-linux-gnu/stage1-rustc/
x86_64-poky-linux-gnu/release/deps/rustc_main-92223b15c9f2d827)
uploaded ".../build/x86_64-unknown-linux-gnu/stage1-rustc/x86_64-poky-linux-gnu/
release/deps/rustc_main-92223b15c9f2d827", waiting for result
/tmp/work/test4056/rustc_main-92223b15c9f2d827: error while loading shared
libraries: librustc_driver-fb0866b1cd913c20.so: cannot open shared object file: No
such file or directory

The rustc_main binary depends on the librustc_driver-*.so file. However,
this file has not been copied to QEMU. If we manually copy the file into
QEMU and export the LD_LIBRARY_PATH, the issue does not occur. Issue
reprorted to upstream and reverted the buggy code as a workaround.

Upstream-Status: Inappropriate [reported at rust-lang/rust#136237]

(From OE-Core rev: 977bd1a10771a6588e596e1bbfd49e9af659aa4a)

Signed-off-by: Deepesh Varatharajan <Deepesh.Varatharajanwindriver.com>
Signed-off-by: Richard Purdie <richard.purdielinuxfoundation.org>