BUG: Fix exporting for Nrrd library

The Nrrd library was always marked for dllexport due to a defines. In
actuallity, on windows this library is build as static. Now
"TEEM_STATIC" is correct defined so that nothing is marked as a dll
interface.

Additionally, the NrrdIO.h file was removed from the itkNrddImageIO.h
to improve encapsulation, and and reduce unneeded headers being used.

Change-Id: I2e23050928cdb9fe6779c29c50a36ab7f4093c9f

Modules/IO/NRRD/include/itkNrrdImageIO.h

@@ -21,7 +21,6 @@
 
 #include "itkImageIOBase.h"
 #include <fstream>
-#include "NrrdIO.h"
 
 namespace itk
 {

Modules/IO/NRRD/src/itkNrrdImageIO.cxx

@@ -17,6 +17,8 @@
  *=========================================================================*/
 
 #include "itkNrrdImageIO.h"
+#include "NrrdIO.h"
+
 #include "itkMetaDataObject.h"
 #include "itkIOCommon.h"
 #include "itkFloatingPointExceptions.h"

Modules/ThirdParty/NrrdIO/src/NrrdIO/CMakeLists.txt

@@ -16,9 +16,13 @@ formatNRRD.c encoding.c encodingRaw.c encodingAscii.c encodingHex.c
 encodingGzip.c subset.c encodingBzip2.c formatEPS.c formatPNG.c 
 formatPNM.c formatText.c formatVTK.c )
 
-# Turn on TEEM_BUILD so that the proper dll export def's are 
-# used on windows builds.
-ADD_DEFINITIONS(-DTEEM_BUILD=1)
+# Turn on TEEM_BUILD and TEEM_STATIIC so that the proper dll export
+# def's are used on windows builds.
+ADD_DEFINITIONS(-DTEEM_BUILD)
+
+if(NOT BUILD_SHARED_LIBS)
+ set(TEEM_STATIC 1)
+endif()
 
 # Configure files with settings for use by the build.
 CONFIGURE_FILE(${ITK3P_NrrdIO_SOURCE_DIR}/NrrdConfigure.h.in

Modules/ThirdParty/NrrdIO/src/NrrdIO/NrrdConfigure.h.in

@@ -41,4 +41,6 @@
   #endif
 #endif
 
+#cmakedefine TEEM_STATIC
+
 #endif // __NrrdConfigure_h

Modules/ThirdParty/NrrdIO/src/NrrdIO/NrrdIO.h

@@ -62,7 +62,6 @@
 extern "C" {
 #endif
 
-#define TEEM_BUILD 1
 #if defined(_WIN32) && !defined(__CYGWIN__) && !defined(TEEM_STATIC)
 #  if defined(TEEM_BUILD) || defined(air_EXPORTS) || defined(teem_EXPORTS)
 #    define NRRDIO_EXPORT extern __declspec(dllexport)