Merged revisions 80665 via svnmerge from

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  r80665 | marc-andre.lemburg | 2010-04-30 19:20:14 +0200 (Fri, 30 Apr 2010) | 7 lines

  [issue8211] configure: ignore AC_PROG_CC hardcoded CFLAGS

  Only override the AC_PROG_CC determined CFLAGS if they were set by the user.
  This restores the default behavior in the common case of not having CFLAGS
  defined when running configure.
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