Remove unused arm32 build.

etc/ci/buildbot_steps.yml

@@ -151,36 +151,6 @@ magicleap-nightly:
   - bash ./etc/ci/lockfile_changed.sh
   - ./etc/ci/clean_build_artifacts.sh
 
-arm32:
- env:
-  AR: /usr/bin/arm-linux-gnueabihf-ar
-  AS: /usr/bin/arm-linux-gnueabihf-as
-  CC: /usr/bin/clang-4.0
-  CFLAGS: --target=arm-unknown-linux-gnueabihf -march=armv7a -I/usr/arm-linux-gnueabihf/include/ -fuse-ld=/home/servo/buildbot/slave/arm32/build/support/arm32/fake-ld.sh -Wno-error=unused-command-line-argument
-  CPP: /usr/bin/clang-4.0 -E
-  CPPFLAGS: -I/usr/arm-linux-gnueabihf/include
-  CXX: /usr/bin/clang++-4.0
-  CXXFLAGS: --target=arm-unknown-linux-gnueabihf -march=armv7a -I/usr/arm-linux-gnueabihf/include/ -I/usr/arm-linux-gnueabihf/include/c++/4.8.4/arm-linux-gnueabihf -fuse-ld=/home/servo/buildbot/slave/arm32/build/support/arm32/fake-ld.sh -Wno-error=unused-command-line-argument
-  EXPAT_LIB_DIR: /usr/lib/arm-linux-gnueabihf
-  HOST_CC: gcc-5
-  # test-tidy doesn't like empty strings
-  HOST_CFLAGS: --target=x86_64-unknown-linux-gnu
-  HOST_CXX: g++-5
-  # test-tidy doesn't like empty strings
-  HOST_CXXFLAGS: --target=x86_64-unknown-linux-gnu
-  LD: /usr/bin/arm-linux-gnueabihf-ld
-  OBJCOPY: /usr/bin/arm-linux-gnueabihf-objcopy
-  OBJDUMP: /usr/bin/arm-linux-gnueabihf-objdump
-  RANLIB: /usr/bin/arm-linux-gnueabihf-ranlib
-  STRIP: /usr/bin/arm-linux-gnueabihf-strip
- commands:
-  - ./mach clean-nightlies --keep 3 --force
-  - ./mach clean-cargo-cache --keep 3 --force
-  - ./etc/ci/clean_build_artifacts.sh
-  - env --unset CC_arm-unknown-linux-gnueabihf --unset CXX_arm-unknown-linux-gnueabihf ./mach build --rel --target=arm-unknown-linux-gnueabihf
-  - bash ./etc/ci/lockfile_changed.sh
-  - ./etc/ci/clean_build_artifacts.sh
-
 arm64:
  env:
   AR: /usr/bin/aarch64-linux-gnu-ar
@@ -222,3 +192,6 @@ mac-rel-wpt1: []
 android-nightly: []
 windows-msvc-nightly: []
 mac-nightly: []
+
+# No longer maintained
+arm32: []