Add spec for overwriting a specialized Struct method through a module
Add spec for overwriting a specialized Struct method through a module

In Rubinius we specialize certain methods for Structs. These however,
need to be overwritable by including a module. This adds a spec for this
case.

pH14/rubinius,mlarraz/rubinius,ngpestelos/rubinius,ngpestelos/rubinius,jemc/rubinius,jsyeo/rubinius,jsyeo/rubinius,benlovell/rubinius,Azizou/rubinius,Azizou/rubinius,kachick/rubinius,sferik/rubinius,benlovell/rubinius,Wirachmat/rubinius,jsyeo/rubinius,Azizou/rubinius,dblock/rubinius,sferik/rubinius,Azizou/rubinius,pH14/rubinius,mlarraz/rubinius,digitalextremist/rubinius,ruipserra/rubinius,ngpestelos/rubinius,Wirachmat/rubinius,Wirachmat/rubinius,pH14/rubinius,digitalextremist/rubinius,kachick/rubinius,jemc/rubinius,digitalextremist/rubinius,kachick/rubinius,sferik/rubinius,sferik/rubinius,jsyeo/rubinius,kachick/rubinius,ruipserra/rubinius,kachick/rubinius,mlarraz/rubinius,jsyeo/rubinius,benlovell/rubinius,benlovell/rubinius,mlarraz/rubinius,benlovell/rubinius,Azizou/rubinius,kachick/rubinius,jemc/rubinius,jsyeo/rubinius,digitalextremist/rubinius,heftig/rubinius,Wirachmat/rubinius,Azizou/rubinius,dblock/rubinius,ngpestelos/rubinius,ruipserra/rubinius,mlarraz/rubinius,Wirachmat/rubinius,dblock/rubinius,pH14/rubinius,ngpestelos/rubinius,digitalextremist/rubinius,Azizou/rubinius,dblock/rubinius,kachick/rubinius,kachick/rubinius,digitalextremist/rubinius,heftig/rubinius,heftig/rubinius,heftig/rubinius,sferik/rubinius,dblock/rubinius,mlarraz/rubinius,heftig/rubinius,sferik/rubinius,jsyeo/rubinius,benlovell/rubinius,benlovell/rubinius,jemc/rubinius,sferik/rubinius,ruipserra/rubinius,jemc/rubinius,ngpestelos/rubinius,pH14/rubinius,dblock/rubinius,ruipserra/rubinius,heftig/rubinius,ngpestelos/rubinius,ruipserra/rubinius,mlarraz/rubinius,heftig/rubinius,jemc/rubinius,dblock/rubinius,pH14/rubinius,Wirachmat/rubinius,ruipserra/rubinius,jemc/rubinius,pH14/rubinius,digitalextremist/rubinius,Wirachmat/rubinius