[Patch,Fortran] Support reading BOZ for real(10)/complex(10) (on hardware with integer(16) support)

[Tobias Burnus]

Hi,

F2008 allows BOZ edit descriptors also for REAL/COMPLEX. (Whether
F9x/F2003 allows it, is a bit disputed, see PR. Richard Maine claims it
is not ;-)

Currently, reading real(10) via BOZ edit descriptors fails with a
run-time error.

Jerry recently added a patch which allows writing large-kind
real/complex BOZ. This patch adds reading support (kind=10, kind=16 was
already supported) - but only for systems which have integer(16). Thus
it will work on x86-64 but not on x86(-32). For integer(8) only systems,
it is more complicated and left as an exercise in the PR.

Bootstrapped and regtested (check-gfortran, check libgomp) on x86-64-linux.
OK for the trunk?

Tobias
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