[issue8211] configure: allow user-provided CFLAGS to override AC_PROG_CC defaults

[Mark Dickinson]

Mark Dickinson <dickinsm at gmail.com> added the comment:

Ah, I understand now: -O2 started appearing in debug builds in r79218, which changed the Makefile to respect CFLAGS.  I tested a variety of revision, but failed to test revision in between that and Victor's change...

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