Objective C sources for only macos should only be added to build under OSX

- moved to macos build config
- made jenkinsfile build much faster.

Jenkinsfile

@@ -17,8 +17,8 @@ qmake'''
     stage('Make') {
       steps {
         sh '''cd xybrid
-make'''
+make -j 17'''
       }
     }
   }
-}
+}

xybrid/xybrid.pro

@@ -31,11 +31,9 @@ CONFIG += c++17
 QMAKE_CXXFLAGS_DEBUG += -Og
 
 # automatically build file lists
-SOURCES += $$files(*.cpp, true) \
-    util/macos_urlhelper.mm
+SOURCES += $$files(*.cpp, true)
 HEADERS += $$files(*.h, true) \
-           $$files(*.hpp, true) \
-           util/macos_urlhelper.h
+           $$files(*.hpp, true)
 FORMS += $$files(*.ui, true)
 RESOURCES += res/resources.qrc
 
@@ -52,7 +50,8 @@ macx: {
     LIBS += -L/usr/local/Cellar/boost/1.70.0/lib/ -lboost_math_tr1
     LIBS    += -framework OpenGL
     LIBS    += -framework Foundation
-    OBJECTIVE_SOURCES += util/macos_urlhelper.h
+    SOURCES += util/macos_urlhelper.mm
+    HEADERS += util/macos_urlhelper.h
     QMAKE_CXXFLAGS += -I/usr/local/Cellar/boost/1.70.0/include/
 }