Fix MSYS2 build breakage

wxPlatformInfo::Get() causes a linker error on Msys2.

Fix this by making common link wx explicitly, rather
than implicity via it's dependencies, which cause
wrong-order linker command lines on windows.

common/CMakeLists.txt

@@ -430,6 +430,7 @@ target_link_libraries( common
     ${Boost_LIBRARIES}
     ${CURL_LIBRARIES}
     ${OPENSSL_LIBRARIES}        # empty on Apple
+    ${wxWidgets_LIBRARIES}
     )