ci(linux): configure gcc-multilib and libclang for *BSD builds

Author: rami3l

ci/docker/x86_64-unknown-freebsd/Dockerfile

@@ -1,4 +1,8 @@
 FROM rust-x86_64-unknown-freebsd
 
+# Building `aws-lc-rs` for Linux depends on `gcc-multilib`, `libclang` and `bindgen`.
+# See: https://aws.github.io/aws-lc-rs/requirements/linux
+RUN apt-get update && apt-get install -qy gcc-multilib libclang-dev
+
 ENV CC_x86_64_unknown_freebsd=x86_64-unknown-freebsd12-clang \
     CARGO_TARGET_X86_64_UNKNOWN_FREEBSD_LINKER=x86_64-unknown-freebsd12-clang

ci/docker/x86_64-unknown-illumos/Dockerfile

@@ -1,5 +1,9 @@
 FROM rust-x86_64-unknown-illumos
 
+# Building `aws-lc-rs` for Linux depends on `gcc-multilib`, `libclang` and `bindgen`.
+# See: https://aws.github.io/aws-lc-rs/requirements/linux
+RUN apt-get update && apt-get install -qy gcc-multilib libclang-dev
+
 ENV \
   AR_x86_64_unknown_illumos="x86_64-illumos-ar" \
   RANLIB_x86_64_unknown_illumos="x86_64-illumos-ranlib" \

ci/docker/x86_64-unknown-netbsd/Dockerfile

@@ -1,3 +1,7 @@
 FROM rust-x86_64-unknown-netbsd
 
+# Building `aws-lc-rs` for Linux depends on `gcc-multilib`, `libclang` and `bindgen`.
+# See: https://aws.github.io/aws-lc-rs/requirements/linux
+RUN apt-get update && apt-get install -qy gcc-multilib libclang-dev
+
 ENV CARGO_TARGET_X86_64_UNKNOWN_NETBSD_LINKER=x86_64--netbsd-gcc-sysroot