Update more paths for the new toolchain.

Author: sunfishcode

ci/docker/mips-unknown-linux-musl/Dockerfile

@@ -15,10 +15,10 @@ RUN curl --retry 5 -L https://downloads.openwrt.org/releases/21.02.1/targets/ath
 
 # See https://lkml.org/lkml/2014/3/14/269
 COPY sysinfo_guard.patch /toolchain
-RUN patch /toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/include/linux/kernel.h </toolchain/sysinfo_guard.patch
+RUN patch /toolchain/staging_dir/toolchain-mips_24kc_gcc-8.4.0_musl/include/linux/kernel.h </toolchain/sysinfo_guard.patch
 
-ENV PATH=$PATH:/rust/bin:/toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl/bin \
+ENV PATH=$PATH:/rust/bin:/toolchain/staging_dir/toolchain-mips_24kc_gcc-8.4.0_musl/bin \
     STAGING_DIR=/toolchain/staging_dir \
     CC_mips_unknown_linux_musl=mips-openwrt-linux-musl-gcc \
     CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_LINKER=mips-openwrt-linux-musl-gcc \
-    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mips -L /toolchain/staging_dir/toolchain-mips_24kc_gcc-7.4.0_musl"
+    CARGO_TARGET_MIPS_UNKNOWN_LINUX_MUSL_RUNNER="qemu-mips -L /toolchain/staging_dir/toolchain-mips_24kc_gcc-8.4.0_musl"