Removed redundant Qt check and other fixes

This removes a redundant check and moves part of the code to a separate
function.

src/citra_qt/CMakeLists.txt

@@ -107,11 +107,11 @@ if(UNIX AND NOT APPLE)
     install(TARGETS citra-qt RUNTIME DESTINATION "${CMAKE_INSTALL_PREFIX}/bin")
 endif()
 
-if (MSVC)
+function(copy_msvc_libraries)
     include(WindowsCopyFiles)
     set(DLL_DEST "${CMAKE_BINARY_DIR}/bin/$<CONFIG>/")
     windows_copy_files(citra-qt ${SDL2_DLL_DIR} ${DLL_DEST} SDL2.dll)
-    if (Qt5_FOUND)
+
     set(Qt5_DLL_DIR "${Qt5_DIR}/../../../bin")
     set(Qt5_PLATFORMS_DIR "${Qt5_DIR}/../../../plugins/platforms/")
     set(PLATFORMS ${DLL_DEST}platforms/)
@@ -125,9 +125,8 @@ if (MSVC)
         Qt5Widgets$<$<CONFIG:Debug>:d>.*
     )
     windows_copy_files(citra-qt ${Qt5_PLATFORMS_DIR} ${PLATFORMS} qwindows$<$<CONFIG:Debug>:d>.*)
-        unset(Qt5_DLL_DIR)
-        unset(Qt5_PLATFORMS_DIR)
-        unset(PLATFORMS)
-    endif()
-    unset(DLL_DEST)
+endfunction(copy_msvc_libraries)
+
+if (MSVC)
+    copy_msvc_libraries()
 endif()