qtserialport_qt4: enable static build and copy test program

closes #1175

src/qtserialport_qt4-1-static.patch

@@ -0,0 +1,10 @@
+diff --git a/src/serialport/qt4support/serialport.prf b/src/serialport/qt4support/serialport.prf
+index b1d65e1..d20d47a 100644
+--- a/src/serialport/qt4support/serialport.prf
++++ b/src/serialport/qt4support/serialport.prf
+@@ -25,3 +25,5 @@ mac {
+        LIBS += -lQtSerialPort$${QT_LIBINFIX}
+    }
+ }
++
++static:DEFINES += QT_STATIC

src/qtserialport_qt4.mk

@@ -15,8 +15,10 @@ $(PKG)_DEPS     := gcc qt
 
 $(PKG)_UPDATE   := $(call MXE_GET_GITHUB_SHA, $($(PKG)_GH_USER)/$($(PKG)_GH_REPO), $($(PKG)_GH_TREE))
 
-define $(PKG)_BUILD_SHARED
+define $(PKG)_BUILD
     cd '$(1)' && '$(PREFIX)/$(TARGET)/qt/bin/qmake'
     $(MAKE) -C '$(1)' -j '$(JOBS)'
     $(MAKE) -C '$(1)' -j 1 install
+    # install one of the test programs
+    cp -f '$(1)/examples/serialport/cenumerator/release/cenumerator.exe' '$(PREFIX)/$(TARGET)/bin/test-qtserialport_qt4.exe'
 endef