[sr #110285] Probes for C++11 and C11 are too slow

Update of sr #110285 (project autoconf):

                  Status:             In Progress => Ready For Test         

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Follow-up Comment #2:

I just pushed a commit (c16be715) that makes the C++98 and C++11 test programs
exercise only *language* features, not *library* features.  On my computer,
which is quite new, the minimal configure script

    AC_INIT
    AC_PROG_CXX

executes in 4.5 seconds (wall-clock) before this change and 0.5
seconds after.

Please test autoconf master with this change and report whether it fixes the
performance problems for you.

(No code from the autoconf macro archive was used.)

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