[cairo] [rcairo] fix compile errors and warnings

[Øyvind Kolås]

On 9/8/05, Kouhei Sutou <kou at cozmixng.org> wrote:
> I made a patch that fixes compile errors and warnings.

ChangeLog:

2005-09-08  Øyvind Kolås  <pippin at freedesktop.org>

        Integrated patch from Kouhei Sutou <kou at cozmixng.org>.

        * packages/cairo/ext/rb_cairo_exception.h:
        * packages/cairo/ext/rb_cairo_exception.c:
                (rb_cairo_raise_exception),
                (Init_cairo_exception): Added new error types, made exception
                retrieve the status string itself.
        * packages/cairo/ext/rb_cairo_context.c:
                (check_context_status): Simplified exception raising.
        * packages/cairo/ext/rb_cairo_matrix.c:
                (rb_cairo_matrix_copy): create a new matrix when copying.
                (rb_cairo_matrix_invert): do status checking.
                (Init_cairo_matrix): register invert! method.


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