feature request: add optional $DESTDIR support to install

[Etienne Laurin]

Hello,

By modifying install to support DESTDIR I was able to effortlessly
create packages for many source distributions that do not support
DESTDIR but use install.

This patch adds the -P and --destdir options, which, if present,
prefix their argument or the value of $DESTDIR to the destination.

Please consider adding this functionality to install.

Thank you,

Etienne Laurin

install-destdir.patch
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