Remove possibility to use eval

This seems too hard to support safely, and the advantages are minimal as
most cases will be possile to solve by wrapping the builtin into a
function.

src/include/recon.sh

     #     wait_until -t 90 -d 30 my_expensive_command
     #     wait_until -x 7 command_that_should_exit_with_7
     #     wait_until -X "-lt 7" command_that_should_exit_with_less_than_7
-    #     wait_until -e some_bash_builtin
     #
     # Note that polling happens synchronously so if your
     # command blocks for more than specified delay, freequency
     #
     local timeout=10
     local delay=1
-    local use_eval=false
     local es_test="-eq 0"
     while true; do case "$1" in
         -x) es_test="-eq $2"; shift;    ;;
         -X) es_test="$2"; shift;        ;;
-        -e) use_eval=true; shift; break ;;
         -d) delay="$2"; shift 2;        ;;
         -t) timeout="$2"; shift 2;      ;;
         --) shift 1; break;             ;;
         local elapsed=$(($now - $start))
         local es=0
         debug "\$@='$@'"
-        if $use_eval;
-        then
-            eval $@;
-            es=$?
-        else
-            $@;
-            es=$?
-        fi
+        $@;
+        es=$?
         debug -v es
         if [ $es $es_test ];
         then