Tim Ruffing 0d253d52e8 configure: Use modern way to set AR ...

This uses AM_PROG_AR to discover ar, which is the recommended way to do
so. Among other advantages, it honors the AR environment variable (as
set from the outside). The macro has been around since automake 1.11.2
(Dec 2011).

This commit also removes code that discovers ranlib and strip. ranlib
has been obsolete for decades (ar does its task now automatically), and
anyway LT_INIT takes care of discovering it. The code we used to set
STRIP was last mentioned in the automake 1.5 manual. Since automake 1.6
(Mar 2002), strip is discovered automatically when necessary (look for
the *private* macro AM_PROG_INSTALL_STRIP in the automake manual).

2022-03-14 18:35:59 +01:00

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