Maarten Bent 590e32c60b Fix building with wxUSE_STL enabled in VS2019 16.6 ...

Exporting standard C++ library types is not allowed any more, see

https://developercommunity.visualstudio.com/content/problem/1042081/142628801includexhash201332-error-c2338-this-funct.html

so don't use DLL export declarations for wxHash{Map,Set} classes, which
derive from std::{map,set}.

Since the classes are header-only, this should have no direct
consequences. Only classes that extend wxHashMap or wxHashSet, like
wxImageHistogram, have to be made header only as well.

Remove the wxLogError message in wxImageHistogram::FindFirstUnusedColour, so
log.h and translation.h do not have to be included in the header.

Closes https://github.com/wxWidgets/wxWidgets/pull/2009

2020-08-03 12:54:35 +02:00

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