Update copyright years.
Delete config.log before doing anything else. Write additional diagnostics to config.log in case of failures to compile test programs, including the failed test program itself. Add a test for support of -mtune=pentium4 switch to GCC; if it is supported, set up MCPU_FLAG variable on the various Makefiles to use that switch during compilations. (This avoids GCC warning about -mcpu being deprecated.)
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