Add Big5 test file

encoding-reader.scm

@@ -117,6 +117,7 @@
   (for-each writeln (read-declarations-from-file filename))
   (newline))
 
+(try-file "test-big5.scm")
 (try-file "test-euc-jp.scm")
 (try-file "test-shift-jis.scm")
 (try-file "test-utf16-be.scm")

test-big5.scm

@@ -0,0 +1,10 @@
+#! /usr/bin/env gosh
+
+(declare-file
+ (coding Big5)
+ (language scheme r7rs)
+ (copyright 2019 "Lassi Kortela")
+ (spdx-license-identifier "ISC"))
+
+(display "你好世界")
+(newline)