ext/iconv/tests/eucjp2iso2022jp.phpt: skip for "unknown" iconv

This test does a byte comparison of the expected ISO-2022-JP encoding
with the result of iconv(). The ISO-2022-JP encoding, however, is
stateful; there are many ways to arrive at a correct answer. Musl is
known to have an inefficient encoding that causes it to fail this
test, so we add a SKIPIF for the "unknown" iconv implementation that
musl has.

Nothing is wrong here per se, but to support the musl output (and that
of other iconvs), an expert would need to verify it.

Author: orlitzky

ext/iconv/tests/eucjp2iso2022jp.phpt

@@ -2,6 +2,16 @@
 EUC-JP to ISO-2022-JP
 --EXTENSIONS--
 iconv
+--SKIPIF--
+<?php
+// ISO-2022-JP is a stateful encoding, so the right answer is not
+// unique. In particular, musl (type "unknown") is known to have an
+// inefficient encoding for it that does not agree with the expected
+// output below.
+if (ICONV_IMPL == "unknown") {
+    die("skip byte-comparison of stateful encoding with unknown iconv");
+}
+?>
 --INI--
 error_reporting=2039
 --FILE--