iar - remove --vla flag for exporters

The template file already enables VLA as it's for C only. This --vla flag
causes conflicts with --cpp flag that is enabled implicitly if C++ is enabled.

Author: 0xc0170

tools/export/iar.py

@@ -72,6 +72,8 @@ def generate(self):
         project_data['tool_specific']['iar'].setdefault("misc", {})
         project_data['tool_specific']['iar'].update(tool_specific['iar'])
         project_data['tool_specific']['iar']['misc'].update(self.progen_flags)
+        # VLA is enabled via template IccAllowVLA
+        project_data['tool_specific']['iar']['misc']['c_flags'].remove("--vla")
         project_data['common']['build_dir'] = os.path.join(project_data['common']['build_dir'], 'iar_arm')
         self.progen_gen_file('iar_arm', project_data)