[Chicken-janitors] #70: add build option to optimize for speed

[Chicken Trac]

#70: add build option to optimize for speed
--------------------------+-------------------------------------------------
 Reporter:  felix         |       Owner:       
     Type:  enhancement   |      Status:  new  
 Priority:  minor         |   Milestone:  4.2.0
Component:  build system  |     Version:  4.1.x
 Keywords:                |  
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 something like

 {{{
 make ... OPTIMIZE_FOR_SPEED=yes ...
 }}}

 This should use the gcc option `-O3` instead of the default `-Os`.

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Ticket URL: <http://www.irp.oist.jp/trac/chicken/ticket/70>
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