CMake build: copy QT DLLs files to bin directory

AppVeyor build relies on CMake to build the VS project files, which then
is used to build RPCS3, so we must tell CMake to copy Qt DLLs files the
same way VS build does.

rpcs3/CMakeLists.txt

@@ -397,6 +397,31 @@ target_link_libraries(rpcs3 ${RPCS3_QT_LIBS})
 
 set_target_properties(rpcs3 PROPERTIES COTIRE_CXX_PREFIX_HEADER_INIT "${RPCS3_SRC_DIR}/stdafx.h")
 
+if (MSVC)
+  # Under Windows, some QT DLLs need to be in the same directory of the compiled
+  # RPCS3 binary, so copy them from the local QT installation at the end of the
+  # build
+  if (CMAKE_BUILD_TYPE STREQUAL "Debug")
+    # debug build uses different DDLs files
+    set (RUNTIME_DLLS
+      $ENV{QTDIR}/bin/Qt5Cored.dll
+      $ENV{QTDIR}/bin/Qt5Guid.dll
+      $ENV{QTDIR}/bin/Qt5Widgetsd.dll
+      $ENV{QTDIR}/bin/Qt5WinExtrasd.dll
+      )
+  else()
+    set (RUNTIME_DLLS
+      $ENV{QTDIR}/bin/Qt5Core.dll
+      $ENV{QTDIR}/bin/Qt5Gui.dll
+      $ENV{QTDIR}/bin/Qt5Widgets.dll
+      $ENV{QTDIR}/bin/Qt5WinExtras.dll
+      )
+  endif()
+  add_custom_command(TARGET rpcs3 POST_BUILD
+    COMMAND ${CMAKE_COMMAND} -E copy ${RUNTIME_DLLS} ${CMAKE_BINARY_DIR}/bin
+    )
+endif()
+
 cotire(rpcs3)
 
 # Unix installation