iar export: fix invalid optmization flag - remove from misc

The exported project uses project file to set optimization, we can provide this
via misc options. It was recently changed to Ol and this was not handled in our
scripts.

Author: 0xc0170

tools/export/iar/__init__.py

@@ -121,7 +121,7 @@ def generate(self):
         template = ["--vla", "--no_static_destruction"]
         # Flag invalid if set in template
         # Optimizations are also set in template
-        invalid_flag = lambda x: x in template or re.match("-O(\d|time|n|hz?)", x)
+        invalid_flag = lambda x: x in template or re.match("-O(\d|time|n|l|hz?)", x)
         flags['c_flags'] = [flag for flag in c_flags if not invalid_flag(flag)]
 
         try: