REGTEST: script: Add support of alternatives in requited options list

It is now possible to specify a list of "alternatives" for a required
option. This must be done by separating options by a pipe ('|'). A test will be
executed if at least one of them is available. For instance:

  #REQUIRED_OPTIONS=ZLIB|SLZ,LUA,OPENSSL

The function _findtest() has also been sligthly simplified.
1 file changed