Only add them to the global C include paths if they exist. And make sure
to set up proper dependencies so that we notice when they are added or
removed.
Change-Id: Ia9df14f6ae6869927ad3d3a15fb5a8081f616a81
This centralizes verification and common operations, like converting the
path to a source file to the path for a built object.
It also embeds the configuration knowledge into the path, so that we can
remove "${SrcDir}/path" from the ninja file. When SrcDir is '.', that
leads to paths like './path' instead of just 'path' like make is doing,
causing differences in compiled binaries.
Change-Id: Ib4e8910a6e867ce1b7b420d927c04f1142a7589e
