[1.7>master] [MERGE #3473 @MSLaguana] Fixing ninja builds as part of parent make
[1.7>master] [MERGE #3473 @MSLaguana] Fixing ninja builds as part of parent make

Merge pull request #3473 from MSLaguana:fixNinjaBuilds

When trying to use ninja builds as part of node-chakracore,
the parent make process was passing in flags like -r to the child
'make' process, which was actually ninja. The -r flag is not
understood by ninja, so it bails out and fails the build.

If we are building using ninja, then we shouldn't pass on flags
from make.

mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore,Microsoft/ChakraCore,mrkmarron/ChakraCore,Microsoft/ChakraCore