unittests: Create a fake DynamicLinker when necessary

run_unittests.py

@@ -444,7 +444,8 @@ class InternalTests(unittest.TestCase):
     def test_compiler_args_class_gnuld(self):
         cargsfunc = mesonbuild.compilers.CompilerArgs
         ## Test --start/end-group
-        gcc = mesonbuild.compilers.GnuCCompiler([], 'fake', mesonbuild.compilers.CompilerType.GCC_STANDARD, False, MachineChoice.HOST)
+        linker = mesonbuild.linkers.GnuDynamicLinker([], MachineChoice.HOST, 'fake')
+        gcc = mesonbuild.compilers.GnuCCompiler([], 'fake', mesonbuild.compilers.CompilerType.GCC_STANDARD, False, MachineChoice.HOST, linker=linker)
         ## Test that 'direct' append and extend works
         l = cargsfunc(gcc, ['-Lfoodir', '-lfoo'])
         self.assertEqual(l.to_native(copy=True), ['-Lfoodir', '-Wl,--start-group', '-lfoo', '-Wl,--end-group'])