Find Ruby on OpenBSD when installed from ports (#12507)

The ruby library on OpenBSD is named rubyXY, not ruby X.y.
Find that too.

Alex

Modules/FindRuby.cmake

@@ -180,7 +180,7 @@ ENDIF( ${Ruby_FIND_VERSION_SHORT_NODOT} GREATER 18  OR  ${_RUBY_VERSION_SHORT_NO
 
 
 # Determine the list of possible names for the ruby library
-SET(_RUBY_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_RUBY_VERSION_SHORT})
+SET(_RUBY_POSSIBLE_LIB_NAMES ruby ruby-static ruby${_RUBY_VERSION_SHORT} ruby${_RUBY_VERSION_SHORT_NODOT})
 
 IF(WIN32)
    SET( _RUBY_MSVC_RUNTIME "" )