Revert "Fallback to legacy way to build compiler-rt in some Linux bots"

This reverts commit 0441a81.

Author: edymtt

utils/build-presets.ini

@@ -944,9 +944,6 @@ mixin-preset=
 
 skip-test-swiftdocc
 
-# to allow to build under aarch64
-llvm-build-compiler-rt-with-use-runtime=0
-
 [preset: buildbot_linux,release_foundation_tests]
 mixin-preset=buildbot_linux