contrib: drop dead get_machine from test sym check

Author: fanquake

contrib/devtools/test-symbol-check.py

@@ -27,10 +27,6 @@ def call_symbol_check(cc: list[str], source, executable, options):
     os.remove(executable)
     return (p.returncode, p.stdout.rstrip())
 
-def get_machine(cc: list[str]):
-    p = subprocess.run([*cc,'-dumpmachine'], stdout=subprocess.PIPE, text=True)
-    return p.stdout.rstrip()
-
 class TestSymbolChecks(unittest.TestCase):
     def test_ELF(self):
         source = 'test1.c'