COMP: Header guard typo mis-match

clang++ compiler for C++11 caught this minor issue

SimpleITK/Code/BasicFilters/src/sitkCreateKernel.h:18:9: warning:
'__sitkCreateKernel_h' is used as a header guard here, followed by
        ^~~~~~~~~~~~~~~~~~~~

Change-Id: I199fa0f76833b0e6d433ff2bdb90c05bf5d3b0c4
Merge topic 'FixCompWarnHeaderGuard' into next

087a74b9 COMP: Header guard typo mis-match