redhat/docs: Add dist-brew BUILD_FLAGS information

Prarit Bhargavarequested to merge
prarit/kernel-ark:dist-brew-BREW_FLAGS into os-build

Add information about how to set brew options using the BUILD_FLAGS
variable.

Suggested-by: Chris von Recklinghausen crecklin@redhat.com
Signed-off-by: Prarit Bhargava prarit@redhat.com

Edited by Prarit Bhargava

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