Commits on Mar 6, 2019

1. Silent version checks …

   Silence output to stderr if there is no language support installed.
   Most of the version checks already redirect stderr to /dev/null but some
   of them merge stdout and stderr due to historical reasons. In this case
   check whether a binary is available before trying to execute it.
   
   This makes sure that "make" output does not contain unexpected messages
   like
   
       /bin/bash: python2 not found
       /bin/bash: php not found

   

   ilammy committed Mar 6, 2019
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