tools/testbuild.sh: Add debug option (-d)

tools/testbuild.sh

@@ -57,6 +57,7 @@ function showusage {
     echo "  -s Use C++ unsigned long size_t in new operator. Default unsigned int"
     echo "  -a <appsdir> provides the relative path to the apps/ directory.  Default ../apps"
     echo "  -n <nxdir> provides the relative path to the NxWidgets/ directory.  Default ../NxWidgets"
+    echo "  -d enables script debug output"
     echo "  -h will show this help test and terminate"
     echo "  <testlist-file> selects the list of configurations to test.  No default"
     echo ""
@@ -80,6 +81,9 @@ while [ ! -z "$1" ]; do
     host=windows
     wenv=cygwin
     ;;
+    -d )
+    set -x
+    ;;
     -u )
     host=windows
     wenv=ubuntu