TST: add _skip_if_no_xlrd() to test GH5583
new test added in #5583 does not skip_xlrd() and caused failures on sparc.

Noting that we don't seem to have min-dep coverage in travis.

cc @Jaydyou 

wow. [that](https://github.com/pydata/pandas/pull/5995#issuecomment-33333749) sure payed itself off right quick.
cc @yarikoptic
