ada: Fix Ada bootstrap on FreeBSD

Ada bootstrap on FreeBSD/amd64 was also broken by the recent warning
changes:

terminals.c: In function 'allocate_pty_desc':
terminals.c:1200:12: error: implicit declaration of function 'openpty'; did you
mean 'openat'? [-Wimplicit-function-declaration]
 1200 |   status = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
      |            ^~~~~~~
      |            openat

terminals.c: At top level:
terminals.c:1268:9: warning: "TABDLY" redefined
 1268 | #define TABDLY 0
      |         ^~~~~~
In file included from /usr/include/termios.h:38,
                 from terminals.c:1109:
/usr/include/sys/_termios.h:111:9: note: this is the location of the previous definition
  111 | #define TABDLY          0x00000004      /* tab delay mask */
      |         ^~~~~~
make[7]: *** [../gcc-interface/Makefile:302: terminals.o] Error 1

Fixed by including the necessary header and guarding the fallback
definition of TABDLY.

This allowed a 64-bit-only bootstrap on x86_64-unknown-freebsd14.0 to
complete successfully.

2023-12-11  Rainer Orth  <[email protected]>

	gcc/ada:
	* terminals.c [__FreeBSD__]: Include <libutil.h>.
	(TABDLY): Only define if missing.

• [DBH] gcc/ada/terminals.c

ada: Fix Ada bootstrap on Solaris

The recent warning patches broke Ada bootstrap on Solaris:

adaint.c: In function '__gnat_kill':
adaint.c:3597:3: error: implicit declaration of function 'kill'
[-Wimplicit-function-declaration]
 3597 |   kill (pid, sig);
      |   ^~~~

expect.c: In function '__gnat_expect_poll':
expect.c:409:5: error: implicit declaration of function 'memset'
[-Wimplicit-function-declaration]
  409 |     FD_ZERO (&rset);
      |     ^~~~~~~
expect.c:55:1: note: include '<string.h>' or provide a declaration of 'memset'
   54 | #include <sys/wait.h>
  +++ |+#include <string.h>
   55 | #endif

I'm now including the necessary headers: <signal.h> for kill and
<string.h> for memset.

Bootstrapped without regressions on i386-pc-solaris2.11,
sparc-sun-solaris2.11, x86_64-pc-linux-gnu, and
x86_64-apple-darwin23.1.0.

2023-12-03  Rainer Orth  <[email protected]>

	gcc/ada:
	* adaint.c: Include <signal.h>.
	* expect.c: Include <string.h>.

• [DBH] gcc/ada/adaint.c
• [DBH] gcc/ada/expect.c

ada: Use CLOCK_MONOTONIC on VxWorks

The monotonic clock keeps track of the time that has elapsed since
system startup; that is, the value returned by clock_gettime() is the
amount of time (in seconds and nanoseconds) that has passed since the
system booted. The monotonic clock cannot be reset. As a result,
time interval measurements made relative to the monotonic clock are
not subject to errors resulting from the clock time being unexpectedly
adjusted between the interval start and end.

gcc/ada/

	* s-oscons-tmplt.c: #define CLOCK_RT_Ada "CLOCK_MONOTONIC" for
	__vxworks

• [DBH] gcc/ada/s-oscons-tmplt.c