DE (DragonFly): fix build

Author: CarterLi

src/detection/de/de_linux.c

@@ -12,11 +12,18 @@
 #include <ctype.h>
 #ifdef __FreeBSD__
     #include <paths.h>
+    #ifndef _PATH_LOCALBASE
+        #define _PATH_LOCALBASE "/usr/local"
+    #endif
+#elif __OpenBSD__
+    #define _PATH_LOCALBASE "/usr/local"
+#elif __NetBSD__
+    #define _PATH_LOCALBASE "/usr/pkg"
 #endif
 
 static void getKDE(FFstrbuf* result, FFDEOptions* options)
 {
-#ifdef __FreeBSD__
+#ifdef _PATH_LOCALBASE
     ffParsePropFile(_PATH_LOCALBASE "/share/wayland-sessions/plasma.desktop", "X-KDE-PluginInfo-Version =", result);
     if(result->length == 0)
         ffParsePropFile(_PATH_LOCALBASE "/share/xsessions/plasmax11.desktop", "X-KDE-PluginInfo-Version =", result);