msysgit: include old libiconv2 for use by dd.exe and stat.exe.

These two files have been pulled in from CoreUtils and were built against
an old set of libraries. We do not ship these binaries so we can avoid
rebuilding against the current libintl-8 library although this should
be done sometime. Used when running the test suite.

Signed-off-by: Pat Thoyts <patthoyts@users.sourceforge.net>