Windows: replace unlink() with unicode-capable path_unlink()

src/index/recollindex.cpp

@@ -145,7 +145,7 @@ public:
         if (path_exists(m_stopfilename)) {
             LOGINF("recollindex: asking indexer to stop because " <<
                    m_stopfilename << " exists\n");
-            unlink(m_stopfilename.c_str());
+            path_unlink(m_stopfilename);
             stopindexing = true;
         }
         if (stopindexing) {

src/index/webqueue.cpp

@@ -472,10 +472,10 @@ WebQueueIndexer::processone(const string &path,
     dounlink = true;
 out:
     if (dounlink) {
-        if (unlink(path.c_str())) {
+        if (!path_unlink(path)) {
             LOGSYSERR("WebQueueIndexer::processone", "unlink", path);
         }
-        if (unlink(dotpath.c_str())) {
+        if (!path_unlink(dotpath)) {
             LOGSYSERR("WebQueueIndexer::processone", "unlink", dotpath);
         }
     }