Auto merge of #2592 - skrap:uclibc-fix-extproc-type, r=Amanieu

uclibc: fix type of EXTPROC.

All of the other related constants are of type `tcflag_t`, but this one was wrong.  This change will fix the build of `nix`.

(Ref nix-rust/nix#1603)

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

@@ -266,7 +266,7 @@ pub const BUFSIZ: ::c_int = 4096;
 pub const EDEADLOCK: ::c_int = EDEADLK;
 pub const EXTA: ::c_uint = B19200;
 pub const EXTB: ::c_uint = B38400;
-pub const EXTPROC: ::c_int = 0200000;
+pub const EXTPROC: ::tcflag_t = 0200000;
 pub const FAN_MARK_FILESYSTEM: ::c_int = 0x00000100;
 pub const FAN_MARK_INODE: ::c_int = 0x00000000;
 pub const FAN_MARK_MOUNT: ::c_int = 0x10;