tools: add fakeroot

tools: add fakeroot

SELinux support requires setting the appropriate SELinux security context
to files and directories, which needs to happen at build time in order
to support read-only root filesystem scenarios. In order to create these
security contexts, we will have to run some SELinux-specific tools on
the host machine, but that requires root access. This adds support for
fakeroot, which the build process will use to run the SELinux security
context creation and the image creation.

Signed-off-by: Thomas Petazzoni <[email protected]>
Apply to current master, and adjust commit message

Thomas' original work is available at
http://lists.infradead.org/pipermail/openwrt-devel/2019-November/025976.html.

Signed-off-by: W. Michael Petullo <[email protected]>
[add rules.mk FAKEROOT variable]
Signed-off-by: Paul Spooren <[email protected]>
[update, fix macos build]
Signed-off-by: Felix Fietkau <[email protected]>