libwinpr/comm_seria: fix missing define

FreeRDP uses CMSPAR, which is defined by glibc in bits/termios.h .

glibc has two flavours of bits/termios.h: a genmeric 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/0b4/0b4793f0bf9f4c57933897f3480054a4e06528ad/
    http://autobuild.buildroot.org/results/7a2/7a2284d0a2987158fa2e78f789b07c8c6fcdb974/
    http://autobuild.buildroot.org/results/387/3874088c3ccd4bbf76ea0c911ca1ef64c7dc9d1c/
    ...

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Peter Korsgaard <jacmet@uclibc.org>
Cc: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff -durN freerdp-17834af7bb378f85a3b3cc4dcadaa5125a337e16.orig/winpr/libwinpr/comm/comm_serial_sys.c freerdp-17834af7bb378f85a3b3cc4dcadaa5125a337e16/winpr/libwinpr/comm/comm_serial_sys.c
--- freerdp-17834af7bb378f85a3b3cc4dcadaa5125a337e16.orig/winpr/libwinpr/comm/comm_serial_sys.c	2015-09-04 16:20:17.000000000 +0100
+++ freerdp-17834af7bb378f85a3b3cc4dcadaa5125a337e16/winpr/libwinpr/comm/comm_serial_sys.c	2015-10-04 11:07:41.868513726 +0100
@@ -27,6 +27,14 @@
 #include <fcntl.h>
 #include <sys/ioctl.h>
 #include <termios.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
+
 #include <unistd.h>
 
 #include "comm_serial_sys.h"