[MacPorts] #46163: blockout2 @2.4_1: fix build failure

[MacPorts]

#46163: blockout2 @2.4_1: fix build failure
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 Reporter:  jmr@…     |      Owner:  jeremy@…
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:  2.3.3
 Keywords:  haspatch  |       Port:  blockout2
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 Using -I/usr/include/sys is a really bad idea, because if
 -I/usr/include/sys/foo.h and -I/usr/include/foo.h both exist, you get the
 former when you really want the latter. Let’s change malloc.h to the
 correct header instead.

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Ticket URL: <https://trac.macports.org/ticket/46163>
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