[MacPorts] #68439: spice-server: build failures for 10.6, 10.8, 10.9, and 10.11 to 10.14

[MacPorts]

#68439: spice-server: build failures for 10.6, 10.8, 10.9, and 10.11 to 10.14
---------------------+--------------------------
 Reporter:  mascguy  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.8.1
 Keywords:           |       Port:  spice-server
---------------------+--------------------------
 Haven't determined the cause yet - perhaps slightly different behaviour
 across Clang versions, for visibility-related pragmas? - but errors are
 occurring for a mix of older macOS releases:

 {{{
 inputs-channel.cpp:467:1: error: visibility does not match previous
 declaration
 SPICE_GNUC_VISIBLE int spice_server_kbd_leds(SpiceKbdInstance *sin, int
 leds)
 ^
 ./utils.h:28:44: note: expanded from macro 'SPICE_GNUC_VISIBLE'
 #define SPICE_GNUC_VISIBLE __attribute__ ((visibility ("default")))
                                            ^
 ./push-visibility.h:19:13: note: previous attribute is here
 #pragma GCC visibility push(hidden)
             ^
 1 error generated.
 }}}

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Ticket URL: <https://trac.macports.org/ticket/68439>
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