Don't attempt to use chroot() on systems that don't support it.

This has the added bonus of allowing us to use popen() rather than
fork()/exec() for improved portability. Of course, the loss of an
install root is a major reduction of functionality but it's hard to
see what else we could substitute for chroot().

 prefix=@prefix@

 exec_prefix=@exec_prefix@

 libdir=@libdir@

 includedir=@includedir@

 Name: razor

 Description: library for depsolving, installing and removing packages

 Version: @VERSION@

 Requires: libcurl

 Libs: -L${libdir} -lexpat -lz -lrazor

 Cflags: -I${includedir}/razor