Add new test_bitcoin-qt static library dependencies

Avoids following error when qt is statically linked into the test binary, as on
travis:

This application failed to start because it could not find or load the Qt platform plugin "xcb"
in "".

src/qt/test/test_main.cpp

@@ -24,6 +24,24 @@
 
 #include <openssl/ssl.h>
 
+#if defined(QT_STATICPLUGIN)
+#include <QtPlugin>
+#if QT_VERSION < 0x050000
+Q_IMPORT_PLUGIN(qcncodecs)
+Q_IMPORT_PLUGIN(qjpcodecs)
+Q_IMPORT_PLUGIN(qtwcodecs)
+Q_IMPORT_PLUGIN(qkrcodecs)
+#else
+#if defined(QT_QPA_PLATFORM_XCB)
+Q_IMPORT_PLUGIN(QXcbIntegrationPlugin);
+#elif defined(QT_QPA_PLATFORM_WINDOWS)
+Q_IMPORT_PLUGIN(QWindowsIntegrationPlugin);
+#elif defined(QT_QPA_PLATFORM_COCOA)
+Q_IMPORT_PLUGIN(QCocoaIntegrationPlugin);
+#endif
+#endif
+#endif
+
 extern void noui_connect();
 
 static int qt_argc = 1;