git: unbreak world, take 2

[John Marino]

commit f9931f0499c3e12bab6e371d21decb89d9e4df18
Author: John Marino <draco at marino.st>
Date:   Mon Feb 16 15:38:24 2015 +0100

    unbreak world, take 2
    
    The previous style works in the world makefiles but not here.
    Try to fix the unbreak by checking if .MAKE.BUILT.BY is defined before
    attempting to use it.

Summary of changes:
 share/mk/sys.mk | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/f9931f0499c3e12bab6e371d21decb89d9e4df18


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