shell: also do word splitting when -d DELIM is used

The original commit 3bef5d89b0 introduced an additional check
for an unset `opt_d` before doing word splitting. I'm unsure
why it's there in the first place, but the commit message also
describes a different behaviour than what -d actually does in
bash, while the code mostly does the right thing.

`opt_d` sets the line delimiter for read to stop reading and
should not affect word splitting.

Testcase:
$ echo qwe rty | { read -d Z a b; echo a:$a b:$b; }
a:qwe b:rty

function                                             old     new   delta
shell_builtin_read                                  1314    1304     -10

Signed-off-by: Eicke Herbertz <wolletd@posteo.de>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/shell_common.c

@@ -230,7 +230,7 @@ shell_builtin_read(struct builtin_read_params *params)
 		 * without variable names (bash compat).
 		 * Thus, "read" and "read REPLY" are not the same.
 		 */
-		if (!params->opt_d && argv[0]) {
+		if (argv[0]) {
 /* http://www.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_06_05 */
 			const char *is_ifs = strchr(ifs, c);
 			if (startword && is_ifs) {