Fix regular express at speedup file

Fix regular express at speedup file

fix build error
"""
Unescaped left brace in regex is illegal here in regex; marked by <-- HERE in m/(\$(?:elt|new_elt|child|cdata|ent|_?parent|twig_current|next_sibling|first_child|prev_sibling|last_child|ref|elt->_parent))->set_(parent|prev_sibling)\(\s*((?:undef|\$\w+|\$\w+->{ <-- HERE \w+}|\$\w+->\w+|\$\w+->\w+\([^)]+\)))\s*\)/ at speedup line 49, <> line 1.
[   30s] Makefile:278: recipe for target 'Twig.pm' failed
"""

Change-Id: I5fa66f2f967a5fe9aeaa2a6cbae2fd6751b5eb75
Signed-off-by: DongHun Kwak <dh0128.kwak@samsung.com>