Fails to build textproc/mupdf on mips64el/loongson

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Hi Ports maintainer,

Hit another problem when trying to build textproc/mupdf, which says
failed to link 32-bit and 64-bit code:

/usr/bin/ld: build/release/libmupdf.a(Dingbats.cff.o): warning: linking
PIC files with non-PIC files
/usr/bin/ld: build/release/libmupdf.a(Dingbats.cff.o): linking 32-bit
code with 64-bit code
/usr/bin/ld: failed to merge target specific data of file
build/release/libmupdf.a(Dingbats.cff.o)
/usr/bin/ld: build/release/libmupdf.a(NimbusMonoPS-Bold.cff.o): warning:
linking PIC files with non-PIC files
/usr/bin/ld: build/release/libmupdf.a(NimbusMonoPS-Bold.cff.o): linking
32-bit code with 64-bit code
/usr/bin/ld: failed to merge target specific data of file
build/release/libmupdf.a(NimbusMonoPS-Bold.cff.o)

The full build log is attached.