Currently, we only document (e)glibc and uClibc as C libraries on which
we can depend. However, we've supported musl for quite some time now.
So, also refference it in the manual, when dealing with toolchain
options a package may have to depend on.
[Peter: order musl before uClibc]
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
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