RFR: JDK-8067060: build can still fail with spaces following -L on link lines

[Erik Joelsson]

Hello,

Embarrassingly enough, my last fix for the -L and space problem wasn't 
correct. Here is a new fix where I'm reverting the macro definitions 
from using define to simple = assignment. The latter automatically 
strips leading whitespace and IMO fits better for the type of macro that 
should not be called with $(eval ). (See bug for more detailed explanation).

This time I made sure to grep the build log on a mac for '-L ' to make 
sure I didn't miss anything.

Stuart: could you make sure this patch works since I can't repro the 
actual failure?

Bug: https://bugs.openjdk.java.net/browse/JDK-8067060
Webrev: http://cr.openjdk.java.net/~erikj/8067060/webrev.jdk.01/

/Erik