Use posix shell variable expansion substitution instead of subshells with sed

wrappers/dlltool-wrapper.sh

@@ -3,8 +3,9 @@
 DIR="$(cd "$(dirname "$0")" && pwd)"
 export PATH=$DIR:$PATH
 
-TARGET="$(basename $0 | sed 's/-[^-]*$//')"
-ARCH=$(echo $TARGET | sed 's/-.*//')
+BASENAME="$(basename "$0")"
+TARGET="${BASENAME%-*}"
+ARCH="${TARGET%%-*}"
 case $ARCH in
 i686)    M=i386        ;;
 x86_64)  M=i386:x86-64 ;;