[sigc] libsigc++ 2.2.3: tests not building on mingw gcc 4.3.0 alpha

[Paul Goins <general vultaire net>]

I already know by using an alpha gcc that I'm asking for trouble.  The
library itself did seem to build okay; I'm just getting one error on one
of the tests, and I thought I'd report that.

The pastebin for the error is here: http://pastebin.ca/1256336

Summary: after doing a configure and make -k, I get one single error in
tests/test_accum_iter.cc.  I can proceed with a make -k install, with
just the test target failing because of the build errors.  So, I'm
guessing I may be able to use the library (though I don't know yet), but
one of the tests is not compiling right.

Just thought I'd let you guys know, in case it's of interest.  I
apologize in advance if this type of report is "noise".

- Paul Goins