Redirect some headers noticed by the compiler

[..]
In file included from /usr/src/qi/build/tdebase-trinity-14.0.7/twin/compton-tde/common.h:102,
                 from /usr/src/qi/build/tdebase-trinity-14.0.7/twin/compton-tde/compton.h:10,
                 from /usr/src/qi/build/tdebase-trinity-14.0.7/twin/compton-tde/compton.c:12:
/usr/include/sys/poll.h:1:2: warning: #warning redirecting incorrect #include <sys/poll.h> to <poll.h> [-Wcpp]
    1 | #warning redirecting incorrect #include <sys/poll.h> to <poll.h>
[..]

For reference: TDE/tdelibs#64

Signed-off-by: Matías Fonzo <selk@dragora.org>

twin/compton-tde/common.h

@@ -99,7 +99,7 @@
 #include <stdlib.h>
 #include <string.h>
 #include <inttypes.h>
-#include <sys/poll.h>
+#include <poll.h>
 #include <assert.h>
 #include <time.h>
 #include <ctype.h>