toolchain/musl: add version 0.9.15, remove older versions (still broken, but closer to being functional than before) Signed-off-by: Felix Fietkau <nbd@openwrt.org> SVN-Revision: 39750
toolchain/musl: add version 0.9.11 Signed-off-by: Luka Perkov <luka@openwrt.org> SVN-Revision: 37173