Fixed issue with libcouchbase build file failing on some platforms.
Fixed issue with libcouchbase build file failing on some platforms.

Change-Id: Icbc783252b7ef1c0186488f717721485b4a611a4
Reviewed-on: https://review.couchbase.org/c/couchnode/+/167346
Tested-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>

couchbase/couchnode,brett19/couchnode,brett19/couchnode,brett19/couchnode,couchbase/couchnode,couchbase/couchnode,couchbase/couchnode