Remove broken uclibc CI targets

Author: Amanieu

.github/workflows/bors.yml

@@ -154,6 +154,7 @@ jobs:
   # These targets are tier 3 or otherwise need to have CI build std via -Zbuild-std.
   # Because of this, only the nightly compiler can be used on these targets.
   docker_linux_build_std:
+    if: ${{ false }} # This is currently broken
     name: Docker Linux Build-Std Targets
     needs: [docker_linux_tier1, style_check]
     runs-on: ubuntu-20.04

ci/build.sh

@@ -226,7 +226,6 @@ aarch64-unknown-openbsd \
 aarch64-wrs-vxworks \
 armebv7r-none-eabi \
 armebv7r-none-eabihf \
-armv7-unknown-linux-uclibceabihf \
 armv7-wrs-vxworks-eabihf \
 armv7r-none-eabi \
 armv7r-none-eabihf \
@@ -237,9 +236,7 @@ i686-unknown-haiku \
 i686-unknown-netbsd \
 i686-unknown-openbsd \
 i686-wrs-vxworks \
-mips-unknown-linux-uclibc \
 mipsel-sony-psp \
-mipsel-unknown-linux-uclibc \
 mips64-unknown-linux-muslabi64 \
 mips64el-unknown-linux-muslabi64 \
 nvptx64-nvidia-cuda \