Update finding QCA OSSL plugin for Qt5 and C++11

cmake/QCAMacros.cmake

@@ -13,7 +13,7 @@
 function(FIND_QCAOSSL_PLUGIN_CPP PLUGIN_REQUIRED)
 
   # requires Qt and QCA packages to be found
-  if(QT_INCLUDE_DIR AND QT_QTCORE_INCLUDE_DIR AND QT_QTCORE_LIBRARY
+  if(QT_INCLUDES AND Qt5Core_LIBRARIES
      AND QCA_INCLUDE_DIR AND QCA_LIBRARY
      AND NOT CMAKE_CROSSCOMPILING)
 
@@ -38,12 +38,13 @@ function(FIND_QCAOSSL_PLUGIN_CPP PLUGIN_REQUIRED)
     set(TESTCPP "${CMAKE_BINARY_DIR}${CMAKE_FILES_DIRECTORY}/CMakeTmp/qcaossl.cpp")
     file(WRITE ${TESTCPP} "${CODE}")
 
-    set(QCA_INCLUDE_DIRECTORIES "-DINCLUDE_DIRECTORIES:STRING=${QT_INCLUDE_DIR};${QT_QTCORE_INCLUDE_DIR};${QCA_INCLUDE_DIR}")
-    set(QCA_LINK_LIBRARIES "-DLINK_LIBRARIES:STRING=${QT_QTCORE_LIBRARY};${QCA_LIBRARY}")
+    set(QCA_INCLUDE_DIRECTORIES "-DINCLUDE_DIRECTORIES:STRING=${QT_INCLUDES};${QCA_INCLUDE_DIR}")
+    get_target_property(_QtCore_path Qt5::Core LOCATION)
+    set(QCA_LINK_LIBRARIES "-DLINK_LIBRARIES:STRING=${_QtCore_path};${QCA_LIBRARY}")
 
     try_run(RUN_RESULT COMPILE_RESULT
       ${CMAKE_BINARY_DIR} ${TESTCPP}
-      CMAKE_FLAGS "${QCA_INCLUDE_DIRECTORIES}" "${QCA_LINK_LIBRARIES}"
+      CMAKE_FLAGS "-DCMAKE_CXX_STANDARD=11" "${QCA_INCLUDE_DIRECTORIES}" "${QCA_LINK_LIBRARIES}"
       COMPILE_OUTPUT_VARIABLE COMPILE_OUTPUT
     )