Handle old yacc on CentOS6

 - Script assumed all executables take --version argument,
   older yaccs only have -V, not uncommon among unix tools

Author: zbeekman

prerequisites/install-functions/find_or_install.sh

@@ -35,7 +35,7 @@ find_or_install()
   if type "$executable" >& /dev/null; then
     printf "yes.\n"
     package_in_path=true
-    package_version_in_path=$("$executable" --version|head -1)
+    package_version_in_path=$( ("${executable}" --version 2>/dev/null || "${executable}" -V) | head -1)
   else
     printf "no.\n"
     package_in_path=false