New -error arg for find_java

We want our installer to show a (potentially) helpful error
message when find_java can't, well, find java. (Before, find_java
would print nothing).

After this CL is in, then if you pass -e(rror) in as an argument,
find_java will either print the found java.exe path and return 0,
or it will print an error message and return 1.

Change-Id: I5c411ea75a8eecdb0c60aa84350a2a762a30c6d1
1 file changed