add common_factor_test.cpp

[SVN r11862]

status/regression.cfg

@@ -32,6 +32,7 @@ run libs/graph/test/graph.cpp
 run libs/integer/cstdint_test.cpp
 run libs/integer/integer_test.cpp
 run libs/integer/integer_traits_test.cpp
+run libs/math/test/common_factor_test.cpp
 run libs/math/octonion/octonion_test.cpp
 run libs/math/quaternion/quaternion_test.cpp
 run libs/math/special_functions/special_functions_test.cpp