Merge branch 'fix-ecat-endian' into main-master

* fix-ecat-endian:
  BF: Fixed ECAT7 writer endianness issue under OSX PPC

Author: matthew-brett

nibabel/ecat.py

@@ -990,11 +990,11 @@ def to_file_map(self, file_map=None):
             dtype = image.dtype
 
             #Write frame images
-            self._write_data(image, imgf, pos+2, endianness=swapped_code)
+            self._write_data(image, imgf, pos+2, endianness='>')
 
             #Move to dictionnary offset and write dictionnary entry
             self._write_data(mlist[index], imgf, entry_pos,
-                np.uint32, endianness=swapped_code)
+                np.uint32, endianness='>')
 
             entry_pos = entry_pos + 16L