RFR: JDK-8073328: Incremental build of gensrc broken

[Erik Joelsson]

Hello,

Please review this fix for the incremental build behavior of the gensrc 
build step. After JDK-8073152 the charsets would unconditionally get 
regenerated each time make was invoked. The actual culprit was a stray 
backslash which prevented the 'touch' on the next line from executing.

I took the liberty of cleaning up some more, adding to the prerequisites 
lists of the rules in question and fixing whitespace according to our 
guideline [1]. The whitespace changes aren't visible in the webrev.

I also quieted down the gensrc tool for charsets by adding the LOG_INFO 
macro. This will hide the output for the default warn level. To see it, 
run make with "LOG=info". For this to work I had to modify the tool to 
print its unconditional output to stdout instead of stderr. We want to 
keep stderr open to the log for any actual failure messages.

Bug: https://bugs.openjdk.java.net/browse/JDK-8073328
Webrev: http://cr.openjdk.java.net/~erikj/8073328/webrev.jdk.01/

/Erik

[1] http://openjdk.java.net/groups/build/doc/code-conventions.html