west: bossac: handle stty from coreutils on macOS

There might be situations where people are running the coreutils version
of stty on macOS, hence the need for being smarter at detecting when
that might be the case

Signed-off-by: Benjamin Cabé <benjamin@zephyrproject.org>

scripts/west_commands/runners/bossac.py

@@ -149,12 +149,19 @@ class BossacBinaryRunner(ZephyrBinaryRunner):
 
         return None
 
+    def is_gnu_coreutils_stty(self):
+        try:
+            result = subprocess.run(['stty', '--version'], capture_output=True, text=True, check=True)
+            return 'coreutils' in result.stdout
+        except subprocess.CalledProcessError:
+            return False
+
     def set_serial_config(self):
         if platform.system() == 'Linux' or platform.system() == 'Darwin':
             self.require('stty')
 
             # GNU coreutils uses a capital F flag for 'file'
-            flag = '-F' if platform.system() == 'Linux' else '-f'
+            flag = '-F' if self.is_gnu_coreutils_stty() else '-f'
 
             if self.is_extended_samba_protocol():
                 self.speed = '1200'