[RPi] fix vendor header & lib includes / remove project specific include CFLAGS WIP #3428
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The bcm2835-driver package contains several vendor headers & libs which were normally installed to
/opt/vc/include
&/opt/vc/libs
but LE installs them to/usr/...
so we need extra include flags to tell packages where they find these includes.Also the pkgconfig files provided by the Raspberry project contain a
prefix=/opt/vc
var which leads to wrong include paths if pkg-config is used to compile packages.So this PR changes the prefix to
prefix=/usr
& creates symlinks for/opt/vc
to make sure hardcoded include paths were correct & pkg-config creates valid include paths.Tests: