<sys/ioctl.h> shouldn't pollute the namespace as much.

The history has no motivation for <asm/termbits.h>, and other C libraries
don't seem to include any of the extra types and constants that gains us.

This caused problems building FFMPEG, which defines its own B0.

Bug: https://github.com/android-ndk/ndk/issues/630
Test: builds
Change-Id: If032b9fa7860777c13f7bd8e68fb78ff606dcd94
diff --git a/libc/include/sys/ioctl.h b/libc/include/sys/ioctl.h
index 76dc1ff..b48b7f9 100644
--- a/libc/include/sys/ioctl.h
+++ b/libc/include/sys/ioctl.h
@@ -36,8 +36,6 @@
  * terminal-related ioctl data structures such as struct winsize.
  */
 #include <linux/termios.h>
-#include <asm/ioctls.h>
-#include <asm/termbits.h>
 #include <linux/tty.h>
 
 #include <bits/ioctl.h>