jtag remote: fix errs on windows not propagting up
jtag remote: fix errs on windows not propagting up

"call" must be used for xsdb to run in a batch file without exiting right after
it runs.

This MUST be run as a batch file, as opposed to one liner, because
%errorlevel% substituion occurs before the command is run.

iVeia/meta-iveia,iVeia/meta-iveia