Include <cwchar> unconditionally in wchar_from_mb - #359
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The iterator uses `std::mbstate_t` and `std::mbsinit` directly, yet the include of `<cwchar>` was guarded by `BOOST_NO_CWCHAR`. That guard was misleading: when `BOOST_NO_CWCHAR` was defined the header was skipped but the code below still used those symbols, so the file could not compile in that configuration anyway. Therefore, include the header unconditionally. Closes #196.
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The iterator uses
std::mbstate_tandstd::mbsinitdirectly, yet the include of<cwchar>was guarded byBOOST_NO_CWCHAR. That guard was misleading: whenBOOST_NO_CWCHARwas defined the header was skipped but the code below still used those symbols, so the file could not compile in that configuration anyway. Therefore, include the header unconditionally.Closes #196.