hid2file.js generation: process in batch, not each file one-by-one

xsltproc can happily process many files at once, no need to process them
individually and also no need to surround them with the rm, touch, rm
triplet each time to catch a possible error.
When letting xargs actually run the command, then xargs will report
error if any invocation failed. It will not stop execution commands for
remaining input unless the command exists with status 255 explicitly,
but this doesn't matter, processing the whole batch regardless is still
much faster than processing each file separately.
To maximize the number of files that can be processed in a single
command, don't prefix each file with $(SRCDIR)/, but instead cd to
$(SRCRDIR) before running the command.

Change-Id: I532a54f7298d7011900af5e618d75b37649b0477
Reviewed-on: https://gerrit.libreoffice.org/c/help/+/144050
Tested-by: Jenkins
Reviewed-by: Christian Lohmaier <lohmaier+LibreOffice@googlemail.com>

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