Modules/termios.c: stop using TC operations that need termio.h

Modules/termios.c makes use of TCGETA, TCSETA, TCSETAF and TCSETAW if
they are defined. They are defined by kernel headers on a limited set
of CPU architectures, but require the "struct termio" definition to
exist, and this structure definition has been removed from glibc as of
version 2.42.

Since these are seldomly used, we take the approach of just dropping
support for those, in order to fix the following build issue:

./Modules/termios.c:1119:16: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1119 |     {"TCGETA", TCGETA},
      |                ^~~~~~
./Modules/termios.c:1131:16: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1131 |     {"TCSETA", TCSETA},
      |                ^~~~~~
./Modules/termios.c:1134:17: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1134 |     {"TCSETAF", TCSETAF},
      |                 ^~~~~~~
./Modules/termios.c:1137:17: error: invalid application of 'sizeof' to incomplete type 'struct termio'
 1137 |     {"TCSETAW", TCSETAW},
      |                 ^~~~~~~
make[1]: *** [Makefile:3403: Modules/termios.o] Error 1

This issue is observed at least on sparc64, but not on more
"mainstream" CPU architectures, as they do not define
TCGETA/TCSETA/TCSETAF/TCSETAW.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

Author: tpetazzoni

Modules/termios.c

@@ -1116,9 +1116,6 @@ static struct constant {
 #ifdef TCFLSH
     {"TCFLSH", TCFLSH},
 #endif
-#ifdef TCGETA
-    {"TCGETA", TCGETA},
-#endif
 #ifdef TCGETS
     {"TCGETS", TCGETS},
 #endif
@@ -1128,15 +1125,6 @@ static struct constant {
 #ifdef TCSBRKP
     {"TCSBRKP", TCSBRKP},
 #endif
-#ifdef TCSETA
-    {"TCSETA", TCSETA},
-#endif
-#ifdef TCSETAF
-    {"TCSETAF", TCSETAF},
-#endif
-#ifdef TCSETAW
-    {"TCSETAW", TCSETAW},
-#endif
 #ifdef TCSETS
     {"TCSETS", TCSETS},
 #endif