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Nils Goroll authored
this is required for autoconf 2.71, but I have kept the required version at 2.69 and tested that the changes are compatible. Most of the changes come from autoupdate, with this change: AC_PROG_CC_STDC is obsolete, but older autoconf versions do not set the highest possible c standard. So we keep AC_PROG_CC_C99 because we actually require c99, while AC_PROG_CC_STDC could fall back to c89 For varnish.m4, we should apply the same canonical settings as for varnishd itself
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