Allow caf in compiler introspection, distr w/ifort
Allow caf in compiler introspection, distr w/ifort

1. Now FC=caf cmake .. results in using the OpenCoarrays compiler
wrapper to compile the simple programs used for compiler
introspection in the top-level CMakeLists.txt.

2. Now FC=ifort cmake .. -DDISTRIBUTED should result in compiling
with -fcoarray=distributed.  Otherwise, -fcoarray=shared is used.

Item 2 has not been tested yet.

gutmann/coarray_icar