Add #include <sys/select.h> to use fd_set

Fixed: chromium:353744949
Change-Id: Ia3c54c648a4f98b8afd22e5e80ba4ca5808a6d4a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/199054
Reviewed-by: dan sinclair <dsinclair@chromium.org>
Commit-Queue: dan sinclair <dsinclair@chromium.org>
Auto-Submit: David Neto <dneto@google.com>
diff --git a/src/tint/utils/system/terminal_posix.cc b/src/tint/utils/system/terminal_posix.cc
index e820774..db66159 100644
--- a/src/tint/utils/system/terminal_posix.cc
+++ b/src/tint/utils/system/terminal_posix.cc
@@ -29,6 +29,7 @@
 
 #include <unistd.h>
 
+#include <sys/select.h>
 #include <termios.h>
 #include <chrono>
 #include <cstdint>