compiler-rt: Build builtins only for the default target

We were never really supposed to build for multiple target architectures in one
compiler-rt build, so let's use the feature created to do exactly that.

This also happens to fix building for ARM softfp ABI builds, where the target
architecture guessing logics ends up with:

    -- Builtin supported architectures: arm;armv6m

And later on bailing out because of duplicate ninja rules:

    ninja: error: build.ninja:56765: multiple rules generate lib/clang/14.0.0/lib/linux/libclang_rt.builtins-arm.a [-w dupbuild=err]

Signed-off-by: Esben Haabendal <esben.haabendal@huawei.com>
(cherry picked from commit 74c7f6524cddd258f916e8e4acfb9e49d1870b65)

0 files changed, 0 insertions, 0 deletions