Include thread linker flags in pkgconfig file
Include thread linker flags in pkgconfig file

On Debian, it looks like we need to tell any library that links with
libcork to also link with the threading library that libcork was
configured to use.  We can pass that information along using the
pkgconfig file.

redjack/libcork,tempbottle/libcork,tempbottle/libcork,tempbottle/libcork,dcreager/libcork,tempbottle/libcork,tempbottle/libcork,dcreager/libcork,redjack/libcork,rogers0/libcork,redjack/libcork,dcreager/libcork,dcreager/libcork,rogers0/libcork,ifduyue/libcork,tempbottle/libcork,ifduyue/libcork,redjack/libcork,dcreager/libcork,ifduyue/libcork,ifduyue/libcork,rogers0/libcork,redjack/libcork,rogers0/libcork,rogers0/libcork,redjack/libcork,ifduyue/libcork,rogers0/libcork,ifduyue/libcork