Minor bug in ./configure

[Eric Hanchrow]

>>>>> "Eric" == Eric Hanchrow <offby1@blarg.net> writes:

    Eric> I figured all my troubles would be over, but `configure'
    Eric> still complained thusly:

    Eric>     checking for gtk_html_new in -lgtkhtml... no
    Eric>     configure: error: Cannot find gtkhtml.  See the README for more info.

    Eric> This is weird, since 

    Eric>     09:47:28 [offby1@offby1 gnucash]$ nm /usr/lib/libgtkhtml.a | egrep gtk_html_new
    Eric>     00002510 T gtk_html_new
    Eric>              U gtk_html_new

    Eric> So my second question is:

    Eric>         * Why isn't `configure' happy on my box?

The problem was that I didn't have libgdk-pixbuf, and `./configure'
incorrectly reported that problem by saying that it couldn't find
gtkhtml.  So:

* there is a bug in configure -- when libgdk-pixbuf is missing, it
  should say so, but instead it says it cannot find gtkhtml

And:

* The README should mention that libgdk-pixbuf is required to build
  GnuCash.


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