[8u122] Request for approval for 8149714, 8161733, 8161742, 8161761

[Vadim Pakhnushev]

Hello,

Please approve these 4 clean backports.
Reviews for these fixes were done internally.

8149714: [parfait] char array lengths don't match in awt_Font.cpp:1701
https://bugs.openjdk.java.net/browse/JDK-8149714
http://hg.openjdk.java.net/jdk9/client/jdk/rev/dfec431427f9

8161733: [parfait] Memory leak in imageioJPEG.c:2803
https://bugs.openjdk.java.net/browse/JDK-8161733
http://hg.openjdk.java.net/jdk9/client/jdk/rev/f7cb006b293a

8161742: [parfait] Uninitialised memory in isXTestAvailable of 
awt_Robot.c:65
https://bugs.openjdk.java.net/browse/JDK-8161742
http://hg.openjdk.java.net/jdk9/client/jdk/rev/ee42ccb4ab68

8161761: [parfait] 2 JNI exception pending defect groups in 
GraphicsPrimitiveMgr.c
https://bugs.openjdk.java.net/browse/JDK-8161761
http://hg.openjdk.java.net/jdk9/client/jdk/rev/42f457587791

Thanks,
Vadim