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This bashism is not supported by busybox ash. Busybox interprets this as
a single file name and due to the -f flag being passed this does not
result in an error.

This regression was introduced in 010d7fa4.

Without mupdf constantly outputs:

	warning: jbig2dec error: incompatible jbig2dec
	header (0.17) and library (0.18) versions

fixes #10786

For #11400

Fixed CVEs:

- CVE-2020-11739
- CVE-2020-11740
- CVE-2020-11741
- CVE-2020-11742
- CVE-2020-11743

https://github.com/swh/LRDF
RDF library for accessing plugin metadata in the LADSPA plugin system