Add the file to reproduce fuzz issue 57639

It is possible to reproduce the failure with this file following the
instructions with oss-fuzz, though it does not cause a failure in CI.

The failure was introduced in
18c1ffe0df.

fuzz/CMakeLists.txt

@@ -108,7 +108,8 @@ set(CORPUS_OTHER
   27393.fuzz
   28262.fuzz
   30507.fuzz
-  37740.fuzz)
+  37740.fuzz
+  57639.fuzz)
 
 set(CORPUS_DIR ${CMAKE_CURRENT_BINARY_DIR}/qpdf_corpus)
 file(MAKE_DIRECTORY ${CORPUS_DIR})

fuzz/qtest/fuzz.test

@@ -20,7 +20,7 @@ my @fuzzers = (
     ['pngpredictor' => 1],
     ['runlength' => 6],
     ['tiffpredictor' => 1],
-    ['qpdf' => 52],             # increment when adding new files
+    ['qpdf' => 53],             # increment when adding new files
     );
 
 my $n_tests = 0;