Suppress cppcheck errors for OMP. refs #3868

Add cppcheck suppression comments for syntax errors in OMP DEFINES.

Code/Mantid/Framework/Algorithms/src/DiffractionFocussing2.cpp

@@ -401,6 +401,7 @@ void DiffractionFocussing2::execEvent()
 
     int chunkSize = 200;
 
+    // cppcheck-suppress syntaxError
     PRAGMA_OMP(parallel for schedule(dynamic, 1) )
     for (int wiChunk=0;wiChunk<(totalHistProcess/chunkSize)+1;wiChunk++)
     {

Code/Mantid/Framework/DataHandling/src/LoadEventPreNexus.cpp

@@ -533,6 +533,7 @@ void LoadEventPreNexus::procEvents(DataObjects::EventWorkspace_sptr & workspace)
   buffers.resize(numThreads);
   eventVectors = new EventVector_pt *[numThreads];
 
+  // cppcheck-suppress syntaxError
   PRAGMA_OMP( parallel for if (parallelProcessing) )
   for (int i=0; i < int(numThreads); i++)
   {

Code/Mantid/Framework/MDEvents/src/CentroidPeaksMD.cpp

@@ -109,6 +109,7 @@ namespace MDEvents
     /// Radius to use around peaks
     double PeakRadius = getProperty("PeakRadius");
 
+    // cppcheck-suppress syntaxError
     PRAGMA_OMP(parallel for schedule(dynamic, 10) )
     for (int i=0; i < int(peakWS->getNumberPeaks()); ++i)
     {

Code/Mantid/Framework/MDEvents/src/IntegratePeaksMD.cpp

@@ -124,6 +124,7 @@ namespace MDEvents
     if (BackgroundStartRadius < PeakRadius)
       BackgroundStartRadius = PeakRadius;
 
+    // cppcheck-suppress syntaxError
     PRAGMA_OMP(parallel for schedule(dynamic, 10) )
     for (int i=0; i < int(peakWS->getNumberPeaks()); ++i)
     {