BUILD/MINOR: fix solaris build with clang.

clang 9 sets the level to POSIX 2004.

(cherry picked from commit 4831db2f32077469472ebda03e176e6c77dc7472)
Signed-off-by: Willy Tarreau <w@1wt.eu>
(cherry picked from commit 4a89a5dab4c60a808e237f35e9e95412d1bd917a)
Signed-off-by: Willy Tarreau <w@1wt.eu>
1 file changed