Merge #17084: build: Fix #include sys/poll.h to just poll.h (without sys/)

4de0bde build: Fix #include sys/poll.h to just poll.h (without sys/) (Daki Carnhof)

Pull request description:

  http://pubs.opengroup.org/onlinepubs/009695399/functions/poll.html
  http://man7.org/linux/man-pages/man2/poll.2.html

ACKs for top commit:
  Empact:
    ACK 4de0bde

Tree-SHA512: 01c22a62b5bc327b3a46f721312af2283f4e09cb314bc7a3f82dbc1f4eda6f018a394559c4370fee895532e768b8a9152783979d61cb8a0ed86de069f7c150fb

Author: laanwj

src/compat/stdin.cpp

@@ -14,7 +14,7 @@
 #else
 #include <termios.h>    // for SetStdinEcho()
 #include <unistd.h>     // for SetStdinEcho(), isatty()
-#include <sys/poll.h>   // for StdinReady()
+#include <poll.h>       // for StdinReady()
 #endif
 
 #include <compat/stdin.h>