Now uses specialised functions for complex abs

Also doesn't require gil for int and long abs.

Notes:
* I don't think the correct utility code is loaded for complex abs
  (but it should be loaded by the complex data types hopefully)
* Would probably be worth making double and float abs not require gil

Cython/Compiler/Builtin.py

@@ -100,21 +100,39 @@ builtin_function_table = [
                         PyrexTypes.c_uint_type, [
                             PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_int_type, None)
                             ],
-                        is_strict_signature = True)),
+                        is_strict_signature = True, nogil=True)),
     BuiltinFunction('abs',        None,    None,   "__Pyx_abs_long",
                     utility_code = UtilityCode.load("abs_long", "Builtins.c"),
                     func_type = PyrexTypes.CFuncType(
                         PyrexTypes.c_ulong_type, [
                             PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_long_type, None)
                             ],
-                        is_strict_signature = True)),
+                        is_strict_signature = True, nogil=True)),
     BuiltinFunction('abs',        None,    None,   "__Pyx_abs_longlong",
                     utility_code = UtilityCode.load("abs_longlong", "Builtins.c"),
                     func_type = PyrexTypes.CFuncType(
                         PyrexTypes.c_ulonglong_type, [
                             PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_longlong_type, None)
                         ],
-                        is_strict_signature = True)),
+                        is_strict_signature = True, nogil=True)),
+    BuiltinFunction('abs',        None,    None,   "__Pyx_c_abs{0}".format(PyrexTypes.c_double_complex_type.funcsuffix),
+                    func_type = PyrexTypes.CFuncType(
+                        PyrexTypes.c_double_type, [
+                            PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_double_complex_type, None)
+                            ],
+                            is_strict_signature = True, nogil=True)),
+    BuiltinFunction('abs',        None,    None,   "__Pyx_c_abs{0}".format(PyrexTypes.c_float_complex_type.funcsuffix),
+                    func_type = PyrexTypes.CFuncType(
+                        PyrexTypes.c_float_type, [
+                            PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_float_complex_type, None)
+                            ],
+                            is_strict_signature = True, nogil=True)),
+    BuiltinFunction('abs',        None,    None,   "__Pyx_c_abs{0}".format(PyrexTypes.c_longdouble_complex_type.funcsuffix),
+                    func_type = PyrexTypes.CFuncType(
+                        PyrexTypes.c_longdouble_type, [
+                            PyrexTypes.CFuncTypeArg("arg", PyrexTypes.c_longdouble_complex_type, None)
+                            ],
+                            is_strict_signature = True, nogil=True)),
     BuiltinFunction('abs',        "O",    "O",     "PyNumber_Absolute"),
     #('all',       "",     "",      ""),
     #('any',       "",     "",      ""),