oss-fuzz: show meson logs

It should help to make it more clear what causes issues like
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=30140
and https://github.com/google/oss-fuzz/pull/5084

tools/oss-fuzz.sh

@@ -38,7 +38,11 @@ else
     fi
 fi
 
-meson $build -D$fuzzflag -Db_lundef=false
+if ! meson $build -D$fuzzflag -Db_lundef=false; then
+    cat $build/meson-logs/meson-log.txt
+    exit 1
+fi
+
 ninja -v -C $build fuzzers
 
 # The seed corpus is a separate flat archive for each fuzzer,

tools/update-dbus-docs.py

@@ -197,7 +197,7 @@ def subst_output(document, programlisting, stats):
         print(f'COMMAND: {shlex_join(argv)}')
 
     try:
-        out = subprocess.check_output(argv, text=True)
+        out = subprocess.check_output(argv, universal_newlines=True)
     except FileNotFoundError:
         print(f'{executable} not found, ignoring', file=sys.stderr)
         return