Bug#1009448: libpdf-builder-perl: FTBFS: dh_auto_test: error: make -j8 test TEST_VERBOSE=1 returned exit code 2

[Jeff]

In test 13, libpdf-builder-perl produces the attached PDF, which neither 
Firefox nor Evince complains about, and prior to v9.56.0, ghostscript 
accepted happily.

With v9.56.1:

$ gs -q -dNOPAUSE -dBATCH -sDEVICE=pnggray -g20x20 -dPDFFitPage 
-dUseCropBox -sOutputFile=out.png out.pdf
Error: /typecheck in --runpdf--
Operand stack:
    --dict:6/14(L)--   --dict:6/14(L)--   --dict:6/14(L)--   MediaBox 
--nostringval--   20.0   20.0   20.0   20.0   false   20.0   2
Execution stack:
    %interp_exit   .runexec2   --nostringval--   runpdf 
--nostringval--   2   %stopped_push   --nostringval--   runpdf   runpdf 
   false   1   %stopped_push   1990   1   3   %oparray_pop   1989   1 
3   %oparray_pop   1977   1   3   %oparray_pop   1978   1   3 
%oparray_pop   runpdf   runpdf   2   1   1   runpdf 
%for_pos_int_continue   runpdf   runpdf   runpdf
Dictionary stack:
    --dict:765/1123(ro)(G)--   --dict:0/20(G)--   --dict:76/200(L)-- 
--dict:18/20(L)--
Current allocation mode is local
Last OS error: No such file or directory
GPL Ghostscript 9.56.1: Unrecoverable error, exit code 1
free(): double free detected in tcache 2

As ghostscript is only used by the tests for comparison purposes, and 
this does not affect the output of libpdf-builder-perl, I propose that 
we forward this to ghostscript and skip these two tests until we have a fix.
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