Remove FreeBSD's CAP_UNUSED* and CAP_ALL* constants

They aren't stable across OS versions and don't have any legitimate use
in applications.

See rust-lang#4183 for the corresponding
change to the libc-0.2 branch.

libc-test/semver/freebsd.txt

@@ -149,8 +149,6 @@ CAP_ACL_CHECK
 CAP_ACL_DELETE
 CAP_ACL_GET
 CAP_ACL_SET
-CAP_ALL0
-CAP_ALL1
 CAP_BIND
 CAP_BINDAT
 CAP_CHFLAGSAT
@@ -233,10 +231,6 @@ CAP_SOCK_SERVER
 CAP_SYMLINKAT
 CAP_TTYHOOK
 CAP_UNLINKAT
-CAP_UNUSED0_44
-CAP_UNUSED0_57
-CAP_UNUSED1_22
-CAP_UNUSED1_57
 CAP_WRITE
 CCAR_OFLOW
 CCTS_OFLOW

src/unix/bsd/freebsdlike/freebsd/mod.rs

@@ -2656,9 +2656,6 @@ pub const CAP_SOCK_SERVER: u64 = CAP_ACCEPT
     | CAP_SEND
     | CAP_SETSOCKOPT
     | CAP_SHUTDOWN;
-pub const CAP_ALL0: u64 = cap_right!(0, 0x000007FFFFFFFFFFu64);
-pub const CAP_UNUSED0_44: u64 = cap_right!(0, 0x0000080000000000u64);
-pub const CAP_UNUSED0_57: u64 = cap_right!(0, 0x0100000000000000u64);
 pub const CAP_MAC_GET: u64 = cap_right!(1, 0x0000000000000001u64);
 pub const CAP_MAC_SET: u64 = cap_right!(1, 0x0000000000000002u64);
 pub const CAP_SEM_GETVALUE: u64 = cap_right!(1, 0x0000000000000004u64);
@@ -2681,9 +2678,6 @@ pub const CAP_ACL_GET: u64 = cap_right!(1, 0x0000000000040000u64);
 pub const CAP_ACL_SET: u64 = cap_right!(1, 0x0000000000080000u64);
 pub const CAP_KQUEUE_CHANGE: u64 = cap_right!(1, 0x0000000000100000u64);
 pub const CAP_KQUEUE: u64 = CAP_KQUEUE_EVENT | CAP_KQUEUE_CHANGE;
-pub const CAP_ALL1: u64 = cap_right!(1, 0x00000000001FFFFFu64);
-pub const CAP_UNUSED1_22: u64 = cap_right!(1, 0x0000000000200000u64);
-pub const CAP_UNUSED1_57: u64 = cap_right!(1, 0x0100000000000000u64);
 pub const CAP_FCNTL_GETFL: u32 = 1 << 3;
 pub const CAP_FCNTL_SETFL: u32 = 1 << 4;
 pub const CAP_FCNTL_GETOWN: u32 = 1 << 5;