bandwidthd: incorporate fixes for autobuilders

"The build failures of bandwidthd observed in the autobuilders in
	relation to libpng are caused by the usage of -L/usr/lib
	-L/usr/local/lib in the compiler flags, which leads the configure
	script to try to link against a host libpng library."

These issues are fixed by:

* Version bump to -r08
	"[patched] the configure.ac script to remove the hardcoded
	-L/usr/local/lib and -I/usr/local/include. The bandwidthd package
	-was already autoreconfigured, so there is no need to add it."

* "Adding the --without-x option, which ensures that the configure.ac
	script will not add -L/usr/lib to the compiler flags (and we anyway
	haven't added any sort of X.org support to bandwidthd for the
	moment)."
Both fixes by Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>