[gdb/testsuite] Require supports_process_record in gdb.reverse/test_ioctl_TCSETSW.exp

I ran test-case gdb.reverse/test_ioctl_TCSETSW.exp on riscv64-linux, and got:
...
(gdb) record full^M
Process record: the current architecture doesn't support record function.^M
(gdb) FAIL: gdb.reverse/test_ioctl_TCSETSW.exp: record full
...

Fix this by requiring supports_process_record.

Tested on riscv64-linux and x86_64-linux.
1 file changed