do not null-terminate ZipEntry names in openjdk-src builds

OpenJDK's java.util.zip.ZipFile.getEntryBytes should return a byte
array that is not null-terminated, but we were giving it one that was
null-terminated, which caused lookups to fail later when
ZipFile.getInputStream was called.

src/classpath-openjdk.cpp

@@ -1658,9 +1658,8 @@ int64_t JNICALL
     switch (type) {
     case 0: {  // name
       unsigned nameLength = fileNameLength(entry->start);
-      GcByteArray* array = makeByteArray(t, nameLength + 1);
+      GcByteArray* array = makeByteArray(t, nameLength);
       memcpy(array->body().begin(), fileName(entry->start), nameLength);
-      array->body()[nameLength] = 0;
       return reinterpret_cast<int64_t>(array);
     } break;