Patch to fix OpenPCD support in librfid svn HEAD

[Eric Preston]

It's a bit ridiculous that support for OpenPCD has been broken for 9+ months
in svn HEAD of librfid.

That said, I've spent some time and isolated the lines that break OpenPCD
support in the latest subversion revision of librfid, thus I've attached a
patch to fix up OpenPCD support in svn HEAD (revision 2149).

This patch is just a work-around for an IRQ-handling issue that was
introduced in r2100, but I thought it might be of interest to openpcd users
that want to run the latest subversion and play with ISO15693 support.

The current openpcd svn head (r484) and librfid svn head(r2149) work
together again with this patch applied.

I can read a Mifare Classic, Mifare DESFire and an ISO15693 Tag-It tokens
now,
Can someone else test, please?

I'm working on fixing the underlying IRQ issue but the patch let's OpenPCD
users enjoy the newer features of librfid now.

-E
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