FIX: fs-mutex - make resilient against cwd changes.

src/fs_mutex.cc

@@ -5,7 +5,7 @@
 
 namespace pEp {
     namespace PityTest11 {
-        fs_mutex::fs_mutex(std::string mutexpath) : mutexpath{ mutexpath } {}
+        fs_mutex::fs_mutex(std::string mutexpath) : mutexpath{ Utils::path_get_abs(mutexpath) } {}
 
         void fs_mutex::aquire() const
         {
@@ -36,6 +36,5 @@ namespace pEp {
             }
         }
 
-    } // namespace PityTest
+    } // namespace PityTest11
 } // namespace pEp
-