Haven't tested, but seems as above might fix the other gallium-llvm mesa issue I ran into when build for an x86_64 MACHINE.

# meson configure fails when the llvm-config --shared-mode command fails to find libs in ${STAGING_LIBDIR}
# Temp solution copy files from recipe-sysroot/usr/lib64 to recipe-sysroot/usr/lib where llvm-config
# command can find libraries.
do_configure:prepend() {
  install -d "${STAGING_LIBDIR}/../lib"
  cp -ra ${STAGING_LIBDIR}/* ${STAGING_LIBDIR}/../lib
}