Replace IntrinsicFunctions.f with version sent by Tom LeFebvre on 22 Feb 2013.  A quick comparison suggests the only difference between the two files are the end-of-line characters, but a rigorous line-by-line check was not done.
Replace ExtFtn.h with version sent by Tom LeFebvre on 22 Feb 2013.  There is no difference between this file and the previous version but now we know the provenance of the file and the license conditions, which is public domain.