Patch included for fixing `Infinity` stroke size, see patch: #8904 comment 2.

After applied the patch, from screenshot you'd see
that `infstroke.html` is now correctly displaying filled orange square
with hairline border:

Gnash: 0.8.11dev (patched against git 051aa9c 15-Feb-2016) NPAPI
Browser: Iceweasel 10.0.12 (debian)
System: Debian GNU/Linux 7.0 Wheezy i386

I found that there is another problem when `MovieClip.lineStyle()`
was used in the middle of drawing operation rather than at the start,
it would (unexpectedly) close the drawing path.

This problem is reported as bug #26329.

Gnash: 0.8.11dev (git 435d3e9 6-Feb-2016)
Flash Player: 11.2 r202 (11.2.202.491) Standalone
System: Debian GNU/Linux 7.0 Wheezy i386

I have created s simple Flash file using MTASC (Flash 8) which tries to draw
an orange-colored square with `undefined` line thickness (no line stroking, according to docs).

with(mc) {
        lineStyle(undefined,0x000000,100);
        moveTo(10,10);
        beginFill(0xFF9900);
        lineTo(60,10);
        lineTo(60,60);
        lineTo(10,60);
        lineTo(10,10);
        endFill();
}

But when I viewed the file on Gnash, the square was shown
with hairline stroking instead, which is incorrect.

http://i.imgur.com/laFr08z.png
This is a 'correct' result from viewing `undefstroke.html` on browser with Adobe Flash Player.
You'll see that the orange square has no border stroking.

http://i.imgur.com/Zccy8s6.png
This is an image result from viewing `undefstroke.html` on browser with current Gnash 0.8.11dev git.
You'll notice that there's a hairline-width black stroke around the orange square.

Test Flash/HTML file, source code, build script and screenshot
of both cases are attached (undefstroke.zip).

Note: Screenshots were captured at 640x480 display size rather than original
320x240 SWF size, to emphasize the fact that it was hairline-width stroke,
not 1-px stroke.

Gnash: 0.8.11dev (git 6b269f9 24-May-2015) NPAPI
Adobe Flash Player: 11.2 r202 (11.2.202.491) NPAPI binary
Browser: Iceweasel 10.0.12 (debian)
System: Debian GNU/Linux 7.0 Wheezy i386