package/linux-serial-test: fix build on MIPS

Fixes:
 - http://autobuild.buildroot.org/results/86e06fdcaa91dca682651736162e9e743329412c

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Yegor Yefremov <yegorslists@googlemail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/linux-serial-test/0001-linux-serial-test.c-fix-missing-CMSPAR-define-on-MIP.patch

@@ -0,0 +1,54 @@
+From c34767aa22623a21369f1464c52fc4635895223c Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 8 Nov 2019 18:25:35 +0100
+Subject: [PATCH] linux-serial-test.c: fix missing CMSPAR define on MIPS
+
+This patch is an adaptation of
+https://git.busybox.net/buildroot/diff/package/freerdp/0003-add-missing-define.patch?id=78cd32631e959e04b1a2f18be7b0757e21482438
+
+linux-serial-test.c uses CMSPAR, which is defined by glibc in
+bits/termios.h.
+
+glibc has two flavours of bits/termios.h: a generic one and an
+architecture-specific one. When installing, glibc will install the
+architecture-specific file if it exists, otherwise it installs the
+generic file. Only Alpha, MIPS, PPC and Sparc have their own
+bits/termios.h.
+
+The generic bits/termios.h, as well as the Alpha, PPC and Sparc flavours
+do define CMSPAR. However, the MIPS flavour does not define it.
+
+Define CMSPAR to the value from the generic value, which is also the
+value known to the Linux kernel for MIPS.
+
+Fixes:
+ - http://autobuild.buildroot.org/results/1350cc46dcb285772b1a4c90aec6ba38fdb11e3c
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status: https://github.com/cbrake/linux-serial-test/pull/20]
+---
+ linux-serial-test.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/linux-serial-test.c b/linux-serial-test.c
+index 5e7504e..0d4a919 100644
+--- a/linux-serial-test.c
++++ b/linux-serial-test.c
+@@ -17,6 +17,14 @@
+ #include <linux/serial.h>
+ #include <errno.h>
+ 
++/* 
++ * glibc for MIPS has its own bits/termios.h which does not define
++ * CMSPAR, so we vampirise the value from the generic bits/termios.h
++ */
++#ifndef CMSPAR
++#define CMSPAR 010000000000
++#endif
++
+ // command line args
+ int _cl_baud = 0;
+ char *_cl_port = NULL;
+-- 
+2.23.0
+