fix cmake.sh
diff --git a/cmake.sh b/cmake.sh
old mode 100644
new mode 100755
index 507119b..e5af540
--- a/cmake.sh
+++ b/cmake.sh
@@ -52,7 +52,7 @@
     ;;
 esac
 
-if "${ARCH}" == ""; then
+if [ "x${ARCH}" = "x" ]; then
   FLAGS+=" -DCAPSTONE_ARCHITECTURE_DEFAULT=ON"
 else
   FLAGS+=" -DCAPSTONE_ARCHITECTURE_DEFAULT=OFF -DCAPSTONE_${ARCH}_SUPPORT=ON"