configure.ac: add detection of pty.h
#51
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Without the change the build on modern autoconf fails as:
c/tty.c: In function 'allocate_master':
c/tty.c:398:14: error: implicit declaration of function 'openpty'; did you mean 'openat'? [-Wimplicit-function-declaration]
398 | rc = openpty (&master_fd, &slave_fd, NULL, NULL, NULL);
| ^~~~~~~
| openat
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Without the change the build on modern autoconf fails as: