st/nine: Require gcc >= 4.6

Nine code uses some C11 features, and this
leads to compile error on gcc <= 4.5

Another way would have been to use the
-fms-extensions CFLAG

Signed-off-by: David Heidelberg <david@ixit.cz>
Cc: "10.4 10.5 10.6" <mesa-stable@lists.freedesktop.org>
1 file changed