RFR: JDK-8203822 AIX version of jsig.c was not removed in JDK-8200298

[Magnus Ihse Bursie]

For some reason, the AIX version of jsig.c was not removed in 
JDK-8200298, as was intended and reviewed in the webrev. (hg hiccup 
perhaps, or PEBKAC from Yours truly).

Bug: https://bugs.openjdk.java.net/browse/JDK-8203822

Patch inline:
diff --git a/src/java.base/aix/native/libjsig/jsig.c 
b/src/java.base/aix/native/libjsig/jsig.c
deleted file mode 100644
--- a/src/java.base/aix/native/libjsig/jsig.c
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
- * Copyright (c) 2001, 2015, Oracle and/or its affiliates. All rights 
reserved.
[... rest of file omitted]

/Magnus