Revert "add a helper function, for now undocumented"

This reverts commit 8f7f96b.

Author: mm2

src/cmsxform.c

@@ -1457,14 +1457,6 @@ cmsPipeline* CMSEXPORT cmsGetTransformGamutCheckPipeline(cmsHTRANSFORM hTransfor
     return xform->GamutCheck;
 }
 
-// Undocumented: Internal use only
-void CMSEXPORT _cmsSetTransformGamutCheckPipeline(cmsHTRANSFORM hTransform, cmsPipeline* pipeline)
-{
-    _cmsTRANSFORM* xform = (_cmsTRANSFORM*)hTransform;
-    if (xform != NULL) 
-        xform->GamutCheck = pipeline;
-}
-
 // For backwards compatibility
 cmsBool CMSEXPORT cmsChangeBuffersFormat(cmsHTRANSFORM hTransform,
                                          cmsUInt32Number InputFormat,