configure.ac: fix some macro invocation ordering #13278
                
     Merged
            
            
          
      
        
          +36
        
        
          −38
        
        
          
        
      
    
  
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Ensure that AC_CANONICAL_[HOST|TARGET] is invoked before AM_INIT_AUTOMAKE to avoid a warning during autogen.pl.
Since that re-ordering moved some emitted output titles, move the "check directories for spaces" tests into the "Initialization, setup" section. This is effectively a cosmetic change.
This PR filed as a fix to the warning issue noted by @rhc54 in #13275 (comment).