Hello,
This patch fix the Check phase on GNU/Hurd.
Built in Linux and Hurd.

Additional, I have a doubt regarding the outputs of the package, after  
build shows:
/gnu/store/9bx00n7mpxiyp9nyjz5qas53kc3wid5i-pcre-8.40-bin
/gnu/store/qb2mbv1wj3b18ix88blfidyy0yzrzggz-pcre-8.40-doc
/gnu/store/v8ma5z2d1m78f64c9m3dp6s3359w02h0-pcre-8.40

The outputs have different hash, is this correct?