compilefix vdr-2.3.1
http://www.vdr-portal.de/board1-news/board2-vdr-news/p1254237-announce-vdr-developer-version-2-3-1/#post1254237
Signed-of-by: Joerg Bornkessel <hd_brummy@gentoo.org> (25 Okt 2015)

--- displayinfo.c	2008-11-09 10:31:23.000000000 +0100
+++ displayinfo.c	2015-10-14 16:18:28.328868172 +0200
@@ -224,7 +224,7 @@
 void cInfoLines::Action()
 {
    int line = 0;
-   Lock();
+   cThread::Lock();
    Clear();
    Unlock();
    cString osdline = NULL;
@@ -236,7 +236,7 @@
 
       osdline = PrepareInfoline(++line, &isStatic);
       if ((const char*)osdline) {
-         Lock();
+         cThread::Lock();
          Add(new cInfoLine(osdline, isStatic));
          Unlock();
       }
@@ -244,7 +244,7 @@
    while (Running() && NULL != (const char*)osdline && line <= MAX_LINES);
 
    if (!First()) {
-      Lock();
+      cThread::Lock();
       osdline = tr("Error getting system information");
       Add(new cInfoLine(osdline, true));
       state++;
@@ -252,7 +252,7 @@
    }
       else
    {
-      Lock();
+      cThread::Lock();
       state++;
       Unlock();
       if (Running())
@@ -260,7 +260,7 @@
 
       while (Running()) {
          cInfoLine * currentline = NULL;
-         Lock();
+         cThread::Lock();
          if (OsdInitialized)
             firstDisplay = false;
          currentline = First();
@@ -274,7 +274,7 @@
             if (!currentline || !currentline->isStatic()) {
                osdline = PrepareInfoline(line, &isStatic);
                if ((const char*)osdline) {
-                  Lock();
+                  cThread::Lock();
                   currentline->SetStr(osdline);
                   Unlock();
                }
@@ -283,7 +283,7 @@
          }
          while (Running() && NULL != currentline && line <= MAX_LINES);
 
-         Lock();
+         cThread::Lock();
          state++;
          Unlock();