sh: Fix some unquoted variables in tests.

The builtins/getopts1.0 test failed if a single-character file existed in
the current directory.

bin/sh/tests/builtins/getopts1.0

@@ -3,7 +3,7 @@
 printf -- '-1-\n'
 set -- -abc
 getopts "ab:" OPTION
-echo ${OPTION}
+printf '%s\n' "${OPTION}"
 
 # In this case 'getopts' should realize that we have not provided the
 # required argument for "-b".
@@ -14,12 +14,12 @@ echo ${OPTION}
 printf -- '-2-\n'
 set -- -ab
 getopts "ab:" OPTION
-echo ${OPTION}
+printf '%s\n' "${OPTION}"
 getopts "ab:" OPTION 3>&2 2>&1 >&3 3>&-
-echo ${OPTION}
+printf '%s\n' "${OPTION}"
 
 # The 'shift' is aimed at causing an error.
 printf -- '-3-\n'
 shift 1
 getopts "ab:" OPTION
-echo ${OPTION}
+printf '%s\n' "${OPTION}"

bin/sh/tests/builtins/getopts2.0

@@ -3,4 +3,4 @@ set - -ax
 getopts ax option
 set -C
 getopts ax option
-echo $option
+printf '%s\n' "$option"

bin/sh/tests/builtins/getopts9.0

@@ -2,8 +2,8 @@
 
 args='-ab'
 getopts ab opt $args
-echo $?:$opt:$OPTARG
+printf '%s\n' "$?:$opt:$OPTARG"
 for dummy in dummy1 dummy2; do
 	getopts ab opt $args
-	echo $?:$opt:$OPTARG
+	printf '%s\n' "$?:$opt:$OPTARG"
 done