internal.h: removed function declaration

* internal.h (rb_compile_error_str): remove declaration of removed
  internal function at r54189.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57670 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

internal.h

@@ -1069,7 +1069,6 @@ extern VALUE rb_eEAGAIN;
 extern VALUE rb_eEWOULDBLOCK;
 extern VALUE rb_eEINPROGRESS;
 void rb_report_bug_valist(VALUE file, int line, const char *fmt, va_list args);
-PRINTF_ARGS(void rb_compile_error_str(VALUE file, int line, void *enc, const char *fmt, ...), 4, 5);
 VALUE rb_syntax_error_append(VALUE, VALUE, int, int, rb_encoding*, const char*, va_list);
 VALUE rb_check_backtrace(VALUE);
 NORETURN(void rb_async_bug_errno(const char *,int));