Compile errors on MinGW

[TheMostDiligent]

Version/Branch of Dear ImGui:

Version: 1.77 (WIP)
Branch: master

Back-end/Renderer/Compiler/OS

Back-ends: imgui_impl_win32.cpp + custom engine/back-end
Compiler: x86_64-w64-mingw32-c++.exe (x86_64-posix-seh-rev0, Built by MinGW-W64 project) 8.1.0
Operating System: Windows

My Issue/Question:

imgui_impl_win32.cpp fails to compile on MinGW/Windows with error at line 408:

...\imgui\examples\imgui_impl_win32.cpp:408:5: error: 'SetProcessDPIAware' was not declared in this scope
     SetProcessDPIAware();
     ^~~~~~~~~~~~~~~~~~

[ocornut]

I'll see if I can add a fix but you are supposedly to specify a value for _WIN32_WINNT when compiling with Cygwin, otherwise you are compiling for extremely old versions of Windows.

[ocornut]

Pushed a fix. Note that by default if you don't specify a windows version, MinGW is compiling with 0x503 aka "Windows Server 2003" so you'll be missing various features.
See values https://docs.microsoft.com/en-us/cpp/porting/modifying-winver-and-win32-winnt?view=vs-2019

[TheMostDiligent]

Thank you!