[slave-buster] Armhf sairedis build fix (#6248)

Aspell check in sairedis SAI submodule in armhf(32-bit) fails with lang
dictionary not found error.
(https://github.com/opencomputeproject/SAI/blob/master/meta/style.pm#L58)
This issue is described at https://bugs.launchpad.net/qemu/+bug/1805913
and similar to #6239
Re-installing aspell language dictionary in slave docker resolves this issue.

Signed-off-by: Sabareesh Kumar Anandan <[email protected]>

sonic-slave-buster/Dockerfile.j2

@@ -330,6 +330,10 @@ RUN apt-get update && apt-get install -y \
            cd .. && \
            dpkg -i ./doxygen_1.8.13-10_armhf.deb && \
            rm -fr doxygen*
+
+       # Aspell is unable to locate the language dictionaries.
+       # Re-installing aspell-en dictionary to fix it.
+       RUN apt-get install --reinstall -y aspell-en
 {%- endif %}
 
 ## Config dpkg