Compile for UWP

[bricelam]

Missing APIs:

• AddVectoredExceptionHandler in kernel32.dll for libwinpthread-1.dll
• GetHandleInformation in kernel32.dll for libwinpthread-1.dll
• GetSystemTimeAdjustment in kernel32.dll for libwinpthread-1.dll
• GetVersion in kernel32.dll for liblzma-5.dll
• GlobalMemoryStatus in kernel32.dll for liblzma-5.dll
• LoadLibraryA in kernel32.dll for libxml2-2.dll
• MessageBoxW in user32.dll for mod_spatialite.dll, libproj-13.dll, libstdc++-6.dll
• RemoveVectoredExceptionHandler in kernel32.dll for libwinpthread-1.dll
• RtlAddFunctionTable in kernel32.dll for libfreexl-1.dll, libgcc_s_seh-1.dll, libgeos.dll, libgeos_c.dll, libiconv-2.dll, liblzma-5.dll, libproj-13.dll, libstdc++-6.dll, libwinpthread-1.dll, libxml2-2.dll, mod_spatialite.dll, zlib1.dll
• RtlCaptureContext in kernel32.dll for libfreexl-1.dll, libgcc_s_seh-1.dll, libgeos.dll, libgeos_c.dll, libiconv-2.dll, liblzma-5.dll, libproj-13.dll, libstdc++-6.dll, libwinpthread-1.dll, libxml2-2.dll, mod_spatialite.dll, zlib1.dll
• RtlVirtualUnwind in kernel32.dll for libfreexl-1.dll, libgcc_s_seh-1.dll, libgeos.dll, libgeos_c.dll, libiconv-2.dll, liblzma-5.dll, libproj-13.dll, libstdc++-6.dll, libwinpthread-1.dll, libxml2-2.dll, mod_spatialite.dll, zlib1.dll
• SetSystemTime in kernel32.dll for libwinpthread-1.dll
• SetThreadContext in kernel32.dll for libwinpthread-1.dll

[bricelam]

I don't know how relevant it is, but I found status-im/mingw-windows10-uwp.