[lldb][test] TestConstStaticIntegralMember: relax assertion on number of global variables (#73707)

In #73626 we started attaching
`DW_AT_const_value`s on a static data-member's declaration again. In
DWARFv5, those static members are represented with a `DW_TAG_variable`.
When LLDB builds the `ManualDWARFIndex`, it simply iterates over all
DIEs in a CU and puts *any* `DW_TAG_variable` with a constant or
location into the index. So when using the manual index, we can end up
having 2 entries for a static data member in the index, one for the
declaration and one for the definition.

This caused a test failure on Linux (where DWARFv5 is the default and
the tests use the manual index).

This patch loosens the restriction that we find exactly 1 variable.

Author: Michael137

lldb/test/API/lang/cpp/const_static_integral_member/TestConstStaticIntegralMember.py

@@ -118,7 +118,7 @@ def test_class_with_only_const_static(self):
 
     def check_global_var(self, name: str, expect_type, expect_val):
         var_list = self.target().FindGlobalVariables(name, lldb.UINT32_MAX)
-        self.assertEqual(len(var_list), 1)
+        self.assertGreaterEqual(len(var_list), 1)
         varobj = var_list[0]
         self.assertEqual(varobj.type.name, expect_type)
         self.assertEqual(varobj.value, expect_val)