Revert "meta-ohos-core: toolchain: Switch defaults to use clang, compiler-rt and libc++"

This reverts commit a07e1f56.

Forum: https://forum.ostc-eu.org/t/reverting-compiler-back-to-gcc/76/3
Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>
14 jobs for !173 with fix/revert-clang in 359 minutes and 34 seconds (queued for 3 seconds)
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