Draft: sysota: force external linking with clang

When sysota is built with toolchain-clang broken dynamicaly linked binary file is produced [1] if shared linking (GO_DYNLINK) is disabled. As the result strip phase of do_packages fails with [2] Sysota is built with disabled shared linking because of another bug [3] The problem with stripping can be fixed with specifying external linker for clang toolchain (by default Go swutched to internal linker on 64bit arches if -pie has been specified since version 1.15 [4] ). Limiting this change to clang only to be safe.

[1] readelf: Error: no .dynamic section in the dynamic segment

[2] Subprocess output:x86_64-oniro-linux-llvm-strip: error: SHT_STRTAB string table section [index 7] is non-null terminated

[3] sysota#7 (closed)

[4] https://go.dev/doc/go1.15#linker

Fixes: #624 (closed)

Signed-off-by: Pavel Zhukov pavel.zhukov@huawei.com