1.modifications:
    modified:   testsuites/unittest/IO/It_test_IO.h
    modified:   testsuites/unittest/IO/full/IO_test_duplocale_001.cpp
    modified:   testsuites/unittest/IO/io_test.cpp
2.add 19 testcases:
    IO_test_dcgettext_001.cpp
    IO_test_dcgettext_002.cpp
    IO_test_dcngettext_001.cpp
    IO_test_dcngettext_002.cpp
    IO_test_dngettext_001.cpp
    IO_test_dngettext_002.cpp
    IO_test_duplocale_001.cpp
    IO_test_locale_001.cpp
    IO_test_ngettext_001.cpp
    IO_test_nl_langinfo_001.cpp
    IO_test_nl_langinfo_l_001.cpp
    IO_test_strcasecmp_l_001.cpp
    IO_test_strfmon_l_001.cpp
    IO_test_strncasecmp_l_001.cpp
    It_stdio_hasmntopt_001.cpp
    IO_test_gettext_001.cpp
    IO_test_locale_002.cpp
    IO_test_strcasecmp_l_002.cpp
    IO_test_strfmon_l_002.cpp
    IO_test_strncasecmp_l_002.cpp
3.influence:
    none
Signed-off-by: Nliuzhiwan <liuzhiwan2020@163.com>
Change-Id: Ib5883ddb14cfd545f2c5b1685a082f098def0965