配列の使用をやめる

GithubActionsでエラーが出るため。
`printf '%q'`もPOSIXではないらしい。

Author: tyfkda

.github/workflows/test.yml

@@ -39,4 +39,4 @@ jobs:
     - name: test wcc
       run:  make test-wcc
     - name: test wcc gen2
-      run:  make test-wcc-gen2
+      run:  make VERBOSE=1 test-wcc-gen2

tool/run-gen2wcc.sh

@@ -5,9 +5,9 @@ set -e
 PRJROOT=$(cd "$(dirname "$0")/..";pwd)
 WCCWASM=$PRJROOT/cc.wasm
 CWD=.
-EXTRA_OPTS=()
+EXTRA_OPTS=''
 
-while (( $# > 0 ))
+while [ $# -gt 0 ]  # (( $# > 0 ))
 do
   case $1 in
     -C | --current-dir | --current-dir=*)
@@ -22,7 +22,7 @@ do
       fi
       ;;
     --dir=* | --mapdir=*)
-      EXTRA_OPTS+=($1)
+      EXTRA_OPTS="${EXTRA_OPTS} ""$1"  # Escape required?
       ;;
     --)
       shift
@@ -39,13 +39,13 @@ do
   shift
 done
 
+echo "CWD=${CWD}, [${EXTRA_OPTS}]"
+
 if [ ! -e "$WCCWASM" ]; then
   echo "Run 'make wcc-gen2' command to create executable" 1>&2
   exit 1
 fi
 
-echo "CWD=${CWD}, ${EXTRA_OPTS[@]}"
-
 "$PRJROOT/tool/runwasi" \
   --dir="${CWD}" \
   --dir=/tmp \