[LEDE-DEV] musl update: possible compile problems

[Hauke Mehrtens]

Hi,

I updated the patches which are making the kernel headers compatible
with musl libc in this commit:
https://git.openwrt.org/4336efe14b61e47177a2d0863f8391c48cf4a9f5
These are now the versions which are included in upstream Linux kernel 4.15.

This could cause some compile problems in iproute2 and some other
packages when the build dir was not cleaned. To work around this just
run this command to rebuild the musl libc which fixes the compile problems:
	make toolchain/musl/{clean,compile}

Hauke