pillow: import from homebrew/python.
pillow: import from homebrew/python.

Closes #4894.

Signed-off-by: Mike McQuaid <a17fed27eaa842282862ff7c1b9c8395a26ac320@mikemcquaid.com>

quantumsteve/homebrew-science,dpo/homebrew-science,andrewjpage/homebrew-science,pditommaso/homebrew-science,heuermh/homebrew-science,philippbayer/homebrew-science,maplesond/homebrew-science