#2766 windows: wd2d.cpp could not be compiled without UNICODE

[Anonymous]

Gnuplot 6.1 3c2133c built without UNICODE, i.e. UNICODE and _UNICODE are not defined.
Platform: MinGW

Expected behavior: wd2d.cpp can be compiled and Print... in the windows terminal should work like a UNICODE build.

Observed behavior:

src/win/wd2d.cpp:995:8: error: no matching function for call to 'PTOpenProvider'
  hr = PTOpenProvider(printerName, 1, &provider);
       ^
note: candidate function not viable: no known conversion from 'PCTSTR' (aka 'const char *') to 'PCWSTR' (aka 'const wchar_t *') for 1st argument
HRESULT WINAPI PTOpenProvider(PCWSTR pszPrinterName, DWORD dwVersion, HPTPROVIDER *phProvider);
               ^~~~~~~~~~~~~~~~~~~~~~~
src/win/wd2d.cpp:1031:5: error: cannot initialize a parameter of type 'LPCWSTR' (aka 'const wchar_t *') with an lvalue of type 'LPCTSTR' (aka 'const char *')
    szDevice, lpgw->Title,
    ^

[Bastian Märkisch]

Fixed in the main branch.
Why would a non-UNICODE build be still be interesting?