Restore GNU expectations for b32h_5 and b32h_6

Updates util/build-gnu.sh to stop forcing those two basenc tests to
expect empty stdout, so the GNU suite again checks for the leaked five
bytes before failure.

Author: karanabe

util/build-gnu.sh

@@ -268,7 +268,7 @@ sed -i -e "s|invalid suffix in --pages argument|invalid --pages argument|" \
 # When decoding an invalid base32/64 string, gnu writes everything it was able to decode until
 # it hit the decode error, while we don't write anything if the input is invalid.
 sed -i "s/\(baddecode.*OUT=>\"\).*\"/\1\"/g" tests/basenc/base64.pl
-sed -i "s/\(\(b2[ml]_[69]\|b32h_[56]\|z85_8\|z85_35\).*OUT=>\)[^}]*\(.*\)/\1\"\"\3/g" tests/basenc/basenc.pl
+sed -i "s/\(\(b2[ml]_[69]\|z85_8\|z85_35\).*OUT=>\)[^}]*\(.*\)/\1\"\"\3/g" tests/basenc/basenc.pl
 
 # add "error: " to the expected error message
 sed -i "s/\$prog: invalid input/\$prog: error: invalid input/g" tests/basenc/basenc.pl