Use cmake to check if we're on DragonFly BSD instead of __DragonFly__

builds on dragonfly 3.4-RELEASE DragonFly
(cherry picked from commit 08fb406533)

src/CMakeLists.txt

@@ -22,6 +22,13 @@ else()
   set(ENABLE_DETACHING 1)
 endif()
 
+### Handle DragonFlyBSD here instead of using __DragonFly__
+IF(${CMAKE_SYSTEM_NAME} MATCHES "DragonFly")
+  set(HAVE_OS_DRAGONFLYBSD 1)
+else()
+  set(HAVE_OS_DRAGONFLYBSD 0)
+endif()
+
 include(CheckIncludeFiles)
 
 configure_file(config-konsole.h.cmake

src/ProcessInfo.cpp

@@ -635,7 +635,7 @@ private:
             return false;
         }
 
-#if defined(__DragonFly__)
+#if defined(HAVE_OS_DRAGONFLYBSD)
         setName(kInfoProc->kp_comm);
         setPid(kInfoProc->kp_pid);
         setParentPid(kInfoProc->kp_ppid);
@@ -685,7 +685,7 @@ private:
     }
 
     virtual bool readCurrentDir(int aPid) {
-#if defined(__DragonFly__)
+#if defined(HAVE_OS_DRAGONFLYBSD)
         char buf[PATH_MAX];
         int managementInfoBase[4];
         size_t len;

src/config-konsole.h.cmake

@@ -3,3 +3,6 @@
 
 /* Defined if you want detaching enabled */
 #cmakedefine ENABLE_DETACHING 1
+
+/* Defined if on DragonFly BSD */
+#cmakedefine HAVE_OS_DRAGONFLYBSD 1