musl libc generates warnings if <sys/poll.h> is included directly.
Although alsa-lib does not build with -Werror enabled, other packages
which include the alsa-lib public header files (ie libasound.h) might.
(From OE-Core rev: e1c837d52016fdf7861dcbefb5fefbdf23af1886)
Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>