[patch, fortran] Further dependency improvements

[Thomas Koenig]

After some more checking, I found that one useful case was missed:
Conversion functions weren't 'PURE.

This should also open the way to resolving PR 34145.

OK for trunk?

	Thomas

2010-08-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/45159
	* dependency.c (gfc_deb_compare_expr):  Compare equal for equal
	arglists for pure user functions, or for those intrinsic
	functions which are also pure.
	* intrinsics.c (add_conv):  Mark conversion functions as pure.
	(add_char_conversions):  Likewise.

2010-08-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/45159
	* gfortran.dg/dependency_34.f90:  New test.

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