Rename --enable-debug to --disable-debug since the default is enabled

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@8345 d0543943-73ff-0310-b7d9-9358b9ac24b2

configure.in

@@ -140,9 +140,10 @@ elif test "x${ax_cv_c_compiler_vendor}" = "xgnu" ; then
     APR_ADDTO(SWITCH_AM_CFLAGS, -Werror)
 fi
 
-#  Enable debugging
+# Enable debugging (default: on)
+# (rename option if the default is changed)
 AC_ARG_ENABLE(debug,
-[AC_HELP_STRING([--enable-debug],[build with debug information])],[enable_debug="$enableval"],[enable_debug="yes"])
+[AC_HELP_STRING([--disable-debug],[build without debug information])],[enable_debug="$enableval"],[enable_debug="yes"])
 
 if test "${enable_debug}" = "yes"; then
         AC_DEFINE([DEBUG],[],[Enable extra debugging.])