Use the variables method instead of the deprecated vars method

Author: iMichka

pygccxml/binary_parsers/parsers.py

@@ -318,7 +318,7 @@ def merge(self, smbl):
                 f.calling_convention = CCTS.CDECL
                 return decorated, f
             except self.global_ns.declaration_not_found_t:
-                v = self.global_ns.vars(
+                v = self.global_ns.variables(
                     decorated,
                     allow_empty=True,
                     recursive=False)
@@ -407,7 +407,7 @@ def merge(self, smbl):
                 f.calling_convention = CCTS.CDECL
                 return decorated, f
             except self.global_ns.declaration_not_found_t:
-                v = self.global_ns.vars(
+                v = self.global_ns.variables(
                     decorated,
                     allow_empty=True,
                     recursive=False)