Fix wide char related tests on Cygwin

This makes the wide char tests run by `./fish_tests` pass on systems where
sizeof wchar_t is two (e.g., Cygwin). In doing so it corrects several
problems with the underlying code in module *utf8.cpp* such as allowing
five and six byte UTF-8 sequences. They were allowed by the original
Unicode proposal but are not allowed by the adopted standard.

1 files changed, 0 insertions, 2 deletions

diff --git a/src/utf8.h b/src/utf8.h
index 99a12a8e..3879459b 100644
--- a/src/utf8.h
+++ b/src/utf8.h
@@ -33,6 +33,4 @@ bool wchar_to_utf8_string(const std::wstring &input, std::string *result);
 size_t utf8_to_wchar(const char *in, size_t insize, std::wstring *out, int flags);
 size_t wchar_to_utf8(const wchar_t *in, size_t insize, char *out, size_t outsize, int flags);
 
-bool is_wchar_ucs2();
-
 #endif /* !_UTF8_H_ */