Moved PRAGMA() define outside openmp block.

This means that our code base will now compile on non-openmp
compilers.  refs #6592 & #6345

Code/Mantid/Framework/Kernel/inc/MantidKernel/MultiThreaded.h

@@ -18,17 +18,15 @@ namespace Kernel
 } //namespace
 } //namespace
 
-
-
-// _OPENMP is automatically defined if openMP support is enabled in the compiler.
-#ifdef _OPENMP
-
 // The syntax used to dfine a pragma within a macro is different on windows and GCC
-#ifdef _MSC_VER 
+#ifdef _MSC_VER
 #define PRAGMA __pragma
-#else //_MSC_VER 
+#else //_MSC_VER
 #define PRAGMA(x) _Pragma(#x)
-#endif //_MSC_VER 
+#endif //_MSC_VER
+
+// _OPENMP is automatically defined if openMP support is enabled in the compiler.
+#ifdef _OPENMP
 
 #include <omp.h>