builders.sh: create directory softlink to gnu-m toolchain

The TF-A scripts repository has internal CI hardcoded toolchain paths
[1], so while internal CI is running in parallel with Open CI, the latter
needs to support this path as softlink.

[1] https://review.trustedfirmware.org/c/ci/tf-a-ci-scripts/+/10237

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: I7d70f7826058747778b7d947ae4361c2fd62f453
1 file changed