linux: Add definition for IUCLC

This is defined in termios-c_iflag.h (or termbits.h) and it's shared
across all the linux archs, even though it's not POSIX

Author: 3v1n0

libc-test/semver/linux.txt

@@ -1305,6 +1305,7 @@ IP_XFRM_POLICY
 ITIMER_PROF
 ITIMER_REAL
 ITIMER_VIRTUAL
+IUCLC
 IUTF8
 IWEVASSOCREQIE
 IWEVASSOCRESPIE

src/unix/linux_like/mod.rs

@@ -1098,6 +1098,7 @@ pub const ISTRIP: crate::tcflag_t = 0x00000020;
 pub const INLCR: crate::tcflag_t = 0x00000040;
 pub const IGNCR: crate::tcflag_t = 0x00000080;
 pub const ICRNL: crate::tcflag_t = 0x00000100;
+pub const IUCLC: crate::tcflag_t = 0x00000200;
 pub const IXANY: crate::tcflag_t = 0x00000800;
 pub const IMAXBEL: crate::tcflag_t = 0x00002000;
 pub const OPOST: crate::tcflag_t = 0x1;