[Fontconfig] Can't use <edit> on hintstyle

[Baybal Ni]

 Hello, looks like I found a bug.

 I wanted to turn on slight hinting for bold fonts as new freetype lcd
 filter + full hinting works fine on small fonts with hinting
 information included, but totally kills bold and serif without them.

 I used this configuration:

        <match>
                <test target="pattern" name="weight" compare="more">
                        <int>100</int>
                </test>
                <edit mode="assign" name="hintstyle">
                        <int>1</int>
               </edit>
        </match>

 But seems it doesn't work at all