When I optimized the vardeps functionality in JDK-8136385, I caused a
regression when the variable contained '$' characters. By reading the
old value as a makefile using "include", variable substitution is
applied. To work around this, dollar characters need to be escaped
(doubled) prior to printing the variable value to the vardeps makefile.
This causes native libraries to be relinked every time they are
incrementally built because of the "\$ORIGIN" string.
Also updating tests to cover this.
Bug: https://bugs.openjdk.java.net/browse/JDK-8140484
Webrev: http://cr.openjdk.java.net/~erikj/8140484/webrev.01/
/Erik
