r: revision for readline
r: revision for readline

also fix "Symbol not found: _clock_gettime"

Closes #4374.

Signed-off-by: Zhiming Wang <8b27323fb6d62f5e86361e8f8ff85a3c0b4ea967@gmail.com>

maplesond/homebrew-science,philippbayer/homebrew-science,quantumsteve/homebrew-science,dpo/homebrew-science,pditommaso/homebrew-science,heuermh/homebrew-science,andrewjpage/homebrew-science,parcollet/homebrew-science,DabeDotCom/homebrew-science,kozo2/homebrew-science