[PATCH] tools: termios_linux.h: Fix compilation on non-glibc systems

[Pali Rohár]

TCGETS2 is defined in header file asm/ioctls.h provided by linux kernel.
On glib systems it is automatically included by some other glibc include
header file and therefore TCGETS2 is present in termios_linux.h when
linux kernel provides it.

On non-glibc systems (e.g. musl) asm/ioctls.h is not automatically included
which results in the strange error that BOTHER is supported, TCGETS2 not
defined and struct termios does not provide c_ispeed member.

    tools/kwboot.c: In function 'kwboot_tty_change_baudrate':
    tools/kwboot.c:662:6: error: 'struct termios' has no member named 'c_ospeed'
      662 |   tio.c_ospeed = tio.c_ispeed = baudrate;
          |      ^

Fix this issue by explicitly including asm/ioctls.h file which provides
TCGETS2 macro (if supported on selected architecture) to not depending on
glibc auto-include behavior and because termios_linux.h requires it.

With this change it is possible compile kwboot with musl libc.

Reported-by: Michal Vasilek <michal.vasilek at nic.cz>
Signed-off-by: Pali Rohár <pali at kernel.org>
---
Stefan, could you include this patch into -rc queue so kwboot can be
compiled also with musl libc?
---
 tools/termios_linux.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tools/termios_linux.h b/tools/termios_linux.h
index 45f5c1233c01..0806a91180a0 100644
--- a/tools/termios_linux.h
+++ b/tools/termios_linux.h
@@ -29,6 +29,7 @@
 #include <errno.h>
 #include <sys/ioctl.h>
 #include <sys/types.h>
+#include <asm/ioctls.h>
 #include <asm/termbits.h>
 
 #if defined(BOTHER) && defined(TCGETS2)
-- 
2.20.1