updated the debug option function from curl's acinclude.m4

       AC_MSG_RESULT($gccver)

       AC_MSG_CHECKING([if this is icc in disguise])

       AC_EGREP_CPP([^__ICC], [__ICC],

       AC_EGREP_CPP([^__INTEL_COMPILER], [__INTEL_COMPILER],

         dnl action if the text is found, this it has not been replaced by the

         dnl cpp

         [ICC="no"]

         ICC="no"

         AC_MSG_RESULT([no]),

         dnl the text was not found, it was replaced by the cpp

         [ICC="yes"]

         ICC="yes"

         AC_MSG_RESULT([yes])

       )

       if test "$ICC" = "yes"; then

         dnl this is icc, not gcc.

         dnl Warning 279 warns on static conditions in while expressions,

         dnl ignore that.

         dnl ICC warnings we ignore:

         dnl * 279 warns on static conditions in while expressions

         dnl * 269 warns on our "%Od" printf formatters for curl_off_t output:

         dnl   "invalid format string conversion"

         WARN="-wd279"

         WARN="-wd279,269"

         if test "$gccnum" -gt "600"; then

            dnl icc 6.0 and older doesn't have the -Wall flag, although it does

            dnl have -wd<n>

            dnl icc 6.0 and older doesn't have the -Wall flag

            WARN="-Wall $WARN"

         fi

       else dnl $ICC = yes