portability: we use termios.h and sys/ioctl.h

Reported by Maarten De Braekeleer.
https://lists.gnu.org/r/bison-patches/2020-07/msg00079.html

* bootstrap.conf (gnulib_modules): Add termios and sys_ioctl.

NEWS

@@ -8,6 +8,8 @@ GNU Bison NEWS
 
   Portability issues with libtextstyle.
 
+  Portability issues of Bison itself with MSVC.
+
 ** Changes
 
   Improvements and fixes in the documentation.

TODO

@@ -467,6 +467,10 @@ both deterministic and generalized parsing.
 
 It would be great for D to also support this.
 
+The basic ideas of GLR are explained here:
+
+https://www.codeproject.com/Articles/5259825/GLR-Parsing-in-Csharp-How-to-Use-The-Most-Powerful
+
 * Better error messages
 The users are not provided with enough tools to forge their error messages.
 See for instance "Is there an option to change the message produced by

bootstrap.conf

@@ -45,6 +45,8 @@ gnulib_modules='
   relocatable-prog relocatable-script
   rename
   spawn-pipe stdbool stpcpy stpncpy strdup-posix strerror strverscmp
+  sys_ioctl
+  termios
   timevar
   unicodeio unistd unistd-safer unlink unlocked-io
   update-copyright unsetenv verify

lib/.gitignore

@@ -336,6 +336,7 @@
 /sys_types.in.h
 /sys_wait.in.h
 /sysexits.in.h
+/termios.in.h
 /textstyle.h
 /textstyle.in.h
 /time.h

m4/.gitignore

@@ -183,6 +183,7 @@
 /strndup.m4
 /strnlen.m4
 /strverscmp.m4
+/sys_ioctl_h.m4
 /sys_resource_h.m4
 /sys_socket_h.m4
 /sys_stat_h.m4
@@ -190,6 +191,7 @@
 /sys_times_h.m4
 /sys_types_h.m4
 /sys_wait_h.m4
+/termios_h.m4
 /threadlib.m4
 /time_h.m4
 /timespec.m4

src/flex-scanner.h

@@ -121,6 +121,6 @@ static struct obstack obstack_for_string;
     obstack_free (&obstack_for_string, last_string);     \
     last_string = NULL;                                  \
   } while (0)
-#endif
+# endif
 
 #endif