detect OpenBSD

Index: src/gui/configuration.nim
--- src/gui/configuration.nim.orig
+++ src/gui/configuration.nim
@@ -20,11 +20,11 @@ type
 requireLocalesToBeTranslated ("ru", "")
 
 let configDir* =
-  when defined(linux): getHomeDir() / ".config/DMusic"
+  when defined(linux) or defined(openbsd): getHomeDir() / ".config/DMusic"
   else: "."
 
 let dataDir* =
-  when defined(linux): getHomeDir() / ".local/share/DMusic"
+  when defined(linux) or defined(openbsd): getHomeDir() / ".local/share/DMusic"
   else: "."
 
 proc readConfig*: ConfigObj =
