[foreign] SrcGenTest fails on Windows.

[Jorn Vernee]

Hi,

After updating my local copy with the new source generation changes, I'm 
running into a failure of SrcGenTest. The test sources that are 
generated contain paths with backslashes that are not escaped, which is 
causing the compilation of the generated sources to fail. I have created 
the a JBS ticket for this: 
https://bugs.openjdk.java.net/browse/JDK-8221178

The following quickfix is making the test pass: 
http://cr.openjdk.java.net/~jvernee/panama/webrevs/escapepaths/webrev.00

But, maybe we need something for escaping the contents of string 
literals in general?

Jorn