[CODEC-265] Reinstate Base64 HugeLineSeparator test.

The fix for better memory allocation in CODEC-265 fixes the encoding
using a line separator bigger than the default buffer size.

Author: aherbert

src/test/java/org/apache/commons/codec/binary/Base64Test.java

@@ -1306,7 +1306,6 @@ private String toString(final byte[] data) {
      * @see "<a href='https://mail-archives.apache.org/mod_mbox/commons-dev/201202.mbox/%3C4F3C85D7.5060706@snafu.de%3E'>dev@commons.apache.org</a>"
      */
     @Test
-    @Ignore
     public void testHugeLineSeparator() {
         final int BaseNCodec_DEFAULT_BUFFER_SIZE = 8192;
         final int Base64_BYTES_PER_ENCODED_BLOCK = 4;