Add a new unbounded functional sequence. This sequence is indexed by
Big_Positive and so is unbounded from the user and spark points view.
Hower the actually implemented sequence are bounded by Count_Type'Last.
gcc/ada/
* libgnat/a-cfinse.adb, libgnat/a-cfinse.ads: Implementation
files of the sequence.
* Makefile.rtl, impunit.adb: Take into account the add of the
new files