pulseaudio: Treat -Wunused-command-line-argument as error

pulseaudio: Treat -Wunused-command-line-argument as error

This ensures that it does not enble SSE when -msse flag is passed, clang
warns about unused option on non-x86 targets but it must be flagged as
error for configure to notice and fail the check to enable SSE on non-x86
machines

Signed-off-by: Khem Raj <raj.khem@gmail.com>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>