Fix mismatches between .gir name and 'name' attribute (#560419)

Fix mismatches between .gir name and 'name' attribute (#560419)

* tests/boxed.gir tests/constant.gir tests/enum.gir tests/invoke/invoke.c
tests/invoke/testfns-1.0.gir tests/object.gir tests/struct.gir: Fix places
where the 'name' element of <namespace/> didn't match the filename of the
gir, an assumption that the compiler has always expected and now enforces.

svn path=/trunk/; revision=903