musl: Fix definition of NCCS on powerpc(64)

These overwrite the value with their own.

https://git.musl-libc.org/cgit/musl/tree/arch/powerpc/bits/termios.h#n2
https://git.musl-libc.org/cgit/musl/tree/arch/powerpc64/bits/termios.h#n2

Signed-off-by: Jens Reidel <[email protected]>

(backport <#4513>)
(cherry picked from commit f8e5a84)

Author: Gelbpunkt

src/unix/linux_like/linux/musl/mod.rs

@@ -599,7 +599,10 @@ pub const ACCOUNTING: c_short = 9;
 
 pub const SFD_CLOEXEC: c_int = 0x080000;
 
+#[cfg(not(any(target_arch = "powerpc", target_arch = "powerpc64")))]
 pub const NCCS: usize = 32;
+#[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
+pub const NCCS: usize = 19;
 
 pub const O_TRUNC: c_int = 512;
 pub const O_NOATIME: c_int = 0o1000000;