Fix availability check
Fix availability check

The neomake#GetMaker interface changed and therefore only default makers
were returned. This broke the check for makers that changed the exe name
(ie. ruby#mri).

euclio/neomake,neomake/neomake,neomake/neomake,euclio/neomake,nerdrew/neomake,nerdrew/neomake,bonds/neomake,bonds/neomake,datanoise/neomake,KariusDx/neomake,codeinabox/neomake