[gfortran, patch] provide isfinite as a macro

[François-Xavier Coudert]

Right now, libgfortran.h provides a fallback implementation of
isfinite() when it is not available from the system. This
implementation has prototype "int isfinite (double)", which is wrong:
isfinite is supposed to be a macro, accepting float, double and long
double types. Attached patch fixes this problem, and removes the
fallback use of finite(), which can only accept doubles.

This patch fixes a problem with large real(16) numbers on solaris. It
is regtested on sparc-solaris, and the only other platform where it
could go wrong is cygwin, which i'll regtest this evening.

OK for mainline and 4.0 (given that cygwin regtests correctly)?

FX

:ADDPATCH libgfortran:
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