[Cin] arm/termux series (possibly broken on x86)

[Phyllis Smith]

Changes to configure.ac (and 1 small one to autogen.sh) have been checked
into GIT to accommodate Termux/Android + Mat's suggestion to remove
"no-unknown-warning-option".

Anyone who has time and can build, please test.  I had no problems on 64 or
32-bit.  Thanks, Phyllis
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