[lldb][test] Skip unamed symbol test on Arm

Same purpose as #141407,
comitting this directly to get the bot green sooner.

Co-authored-by: Ely Ronnen <elyronnen@gmail.com>

Author: DavidSpickett

lldb/test/API/python_api/unnamed_symbol_lookup/TestUnnamedSymbolLookup.py

@@ -10,6 +10,8 @@
 
 # --keep-symbol causes error on Windows: llvm-strip.exe: error: option is not supported for COFF
 @skipIfWindows
+# Unnamed symbols don't get into the .eh_frame section on ARM, so LLDB can't find them.
+@skipIf(archs=["arm"])
 class TestUnnamedSymbolLookup(TestBase):
     def test_unnamed_symbol_lookup(self):
         """Test looking up unnamed symbol synthetic name"""