ostree: Use libcc for compiler runtime when using glibc for system

[kraj]

glibc static library expects builtins from libgcc which may not exist in compiler-rt, therefore use libgcc explicitly.

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[quaresmajose]

I have used that and we only need it for x86-64, for reference I foundriesio/meta-lmp@0abb08c

[kraj]

nice !. Since you have done this and perhaps tested it a bit longer, would you mind proposing it here ? I would like to include those changes instead