[OpenJDK 2D-Dev] freetypescaler fix for fonts that start with a control point

[Martin Buchholz]

Hi font friends!

I'm trying to share a font rendering bug fix contributed by my colleagues
Behdad and Igor.

http://cr.openjdk.java.net/~martin/webrevs/openjdk9/freetypeScaler-outline/

Repro recipe:

(cd test/java/awt/font/GlyphVector/ && javac GlyphVectorOutline.java &&
wget -q -O/tmp/msgothic.ttc
https://browserlinux-jp.googlecode.com/files/msgothic.ttc && java
GlyphVectorOutline /tmp/msgothic.ttc /tmp/katakana.png)

After successfully running that, examine the two rendered Japanese
characters.

Without our fix, the lower one is misrendered.

I don't know how the fix works, and whether/how the manual test case can be
turned into a real jtreg test.
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