[pkg-lighttpd] Bug#846917: fix debian packaging for lighttpd 1.4.43

[Stefan Bühler]

Hi again,

adding "Multi-Arch: foreign" to lighttpd-doc should fix a lintian warning.

To fix the build hardening warnings I added this to the configure call:

	CPPFLAGS_FOR_BUILD="$(shell dpkg-buildflags --get CPPFLAGS)" \
	CFLAGS_FOR_BUILD="$(shell dpkg-buildflags --get CFLAGS)" \
	LDFLAGS_FOR_BUILD="$(shell dpkg-buildflags --get LDFLAGS)" \

There are probably better ways to set them (lemon is build using
*_FOR_BUILD to support proper cross compilation).