Update Aspectator fixing printing of local static variables

https://forge.ispras.ru/issues/5556

In addition, the commit adds a related test case that covers all storage
class specifiers for local and global variables.

tests/input/c-backend/var-decl-storage-classes.c

@@ -0,0 +1,10 @@
+int var1;
+static int var2;
+extern int var3;
+
+void func(void)
+{
+    int var4;
+    static int var5;
+    register int var6;
+}

tests/output/c-backend/var-decl-storage-classes.c

@@ -0,0 +1,10 @@
+int var1;
+static int var2;
+extern int var3;
+#line 5 "/home/novikov/work/cif/tests/input/c-backend/var-decl-storage-classes.c"
+void func(void)
+{
+  int var4;
+  static int var5;
+  register int var6;
+}

tests/test_c_backend.py

@@ -251,3 +251,7 @@ def test_min_max_expr(self):
     def test_expr_recursion_limit(self):
         self.cif.run(cif_input='input/c-backend/expr-recursion-limit.c', stage='C-backend', cif_output='work/expr-recursion-limit.c')
         self.compare(output='work/expr-recursion-limit.c', expected='output/c-backend/expr-recursion-limit.c')
+
+    def test_var_decl_storage_classes(self):
+        self.cif.run(cif_input='input/c-backend/var-decl-storage-classes.c', stage='C-backend', cif_output='work/var-decl-storage-classes.c')
+        self.compare(output='work/var-decl-storage-classes.c', expected='output/c-backend/var-decl-storage-classes.c')