build: suppress conditional dependencies if there are unconditional dependencies on the same symbol

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37678 3c298f89-4303-0410-b956-a3cf2f4a3e73
build: process transitive dependencies after local dependencies

This improves duplicate dependency detection

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@37679 3c298f89-4303-0410-b956-a3cf2f4a3e73