[chore](toolchain) change doris default toolchain to clang (#20146)
GCC is very slow during build and link. Change to clang as we discussed many times. Co-authored-by: yiguolei <yiguolei@gmail.com>
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GCC is very slow during build and link. Change to clang as we discussed many times. Co-authored-by: yiguolei <yiguolei@gmail.com>