Expose missing flags from libzip at least >= 0.11.x

These are helpful with reading/writing zips containing non UTF-8
filenames to mitigate possibly changed libzip behaviors.

Partial cherry-pick of 893c2405ff

ext/zip/php_zip.c

@@ -3038,6 +3038,24 @@ static PHP_MINIT_FUNCTION(zip)
 	REGISTER_ZIP_CLASS_CONST_LONG("FL_NODIR", ZIP_FL_NODIR);
 	REGISTER_ZIP_CLASS_CONST_LONG("FL_COMPRESSED", ZIP_FL_COMPRESSED);
 	REGISTER_ZIP_CLASS_CONST_LONG("FL_UNCHANGED", ZIP_FL_UNCHANGED);
+
+#ifdef ZIP_FL_ENC_GUESS
+	/* Default filename encoding policy. */
+	REGISTER_ZIP_CLASS_CONST_LONG("FL_ENC_GUESS", ZIP_FL_ENC_GUESS);
+#endif
+#ifdef ZIP_FL_ENC_RAW
+	REGISTER_ZIP_CLASS_CONST_LONG("FL_ENC_RAW", ZIP_FL_ENC_RAW);
+#endif
+#ifdef ZIP_FL_ENC_STRICT
+	REGISTER_ZIP_CLASS_CONST_LONG("FL_ENC_STRICT", ZIP_FL_ENC_STRICT);
+#endif
+#ifdef ZIP_FL_ENC_UTF_8
+	REGISTER_ZIP_CLASS_CONST_LONG("FL_ENC_UTF_8", ZIP_FL_ENC_UTF_8);
+#endif
+#ifdef ZIP_FL_ENC_CP437
+	REGISTER_ZIP_CLASS_CONST_LONG("FL_ENC_CP437", ZIP_FL_ENC_CP437);
+#endif
+
 	REGISTER_ZIP_CLASS_CONST_LONG("CM_DEFAULT", ZIP_CM_DEFAULT);
 	REGISTER_ZIP_CLASS_CONST_LONG("CM_STORE", ZIP_CM_STORE);
 	REGISTER_ZIP_CLASS_CONST_LONG("CM_SHRINK", ZIP_CM_SHRINK);