Bug 1691685 - Add base 32-bits development files to the toolchain sysroot. r=firefox-build-system-reviewers,dmajor

This allows the clang task to build the x86 compiler-rt again.

Differential Revision: https://phabricator.services.mozilla.com/D104583

taskcluster/ci/toolchain/sysroot.yml

@@ -53,6 +53,7 @@ linux64-toolchain-sysroot:
         arguments:
             - amd64
             # For clang
+            - gcc-multilib
             - libxml2-dev
             # For minidump-stackwalk
             - libcurl4-openssl-dev

taskcluster/scripts/misc/build-sysroot.sh

@@ -55,8 +55,10 @@ mmdebstrap \
   http://snapshot.debian.org/archive/debian/$SNAPSHOT/ \
   --dpkgopt=path-exclude="*" \
   --dpkgopt=path-include="/lib/*" \
+  --dpkgopt=path-include="/lib32/*" \
   --dpkgopt=path-include="/usr/include/*" \
   --dpkgopt=path-include="/usr/lib/*" \
+  --dpkgopt=path-include="/usr/lib32/*" \
   --dpkgopt=path-exclude="/usr/lib/debug/*" \
   --dpkgopt=path-exclude="/usr/lib/valgrind/*" \
   --dpkgopt=path-include="/usr/share/pkgconfig/*" \