[nrf fromlist] twister: short build paths - fix

squash! [nrf fromlist] twister: add option to create shorter build paths

This changes was introduced to this open Upstream PR:
zephyrproject-rtos/zephyr#41930

Signed-off-by: Piotr Golyzniak <[email protected]>

Author: gopiotr

scripts/pylib/twister/twisterlib.py

@@ -3904,7 +3904,7 @@ def _create_build_dir_link(self, links_dir_path, instance):
         significant during building by CMake on Windows OS.
         """
 
-        os.makedirs(instance.build_dir)
+        os.makedirs(instance.build_dir, exist_ok=True)
 
         link_name = f"test_{self.link_dir_counter}"
         link_path = os.path.join(links_dir_path, link_name)