Fix constants accidentally removed for Linux uClibc targets

The constants were removed by commit 2fe1d91 for uClibc in all
operating systems. However, the commit was supposed to fix things
for L4Re, not break things for other operating systems.

So this commit limits the uClibc exclusions introduced in 2fe1d91
to apply only if the target OS is L4Re.

Author: operutka

src/unix/linux_like/mod.rs

@@ -805,11 +805,11 @@ pub const IP_TRANSPARENT: c_int = 19;
 pub const IP_ORIGDSTADDR: c_int = 20;
 pub const IP_RECVORIGDSTADDR: c_int = IP_ORIGDSTADDR;
 pub const IP_MINTTL: c_int = 21;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IP_NODEFRAG: c_int = 22;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IP_CHECKSUM: c_int = 23;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IP_BIND_ADDRESS_NO_PORT: c_int = 24;
 pub const IP_MULTICAST_IF: c_int = 32;
 pub const IP_MULTICAST_TTL: c_int = 33;
@@ -831,9 +831,9 @@ pub const IP_PMTUDISC_DONT: c_int = 0;
 pub const IP_PMTUDISC_WANT: c_int = 1;
 pub const IP_PMTUDISC_DO: c_int = 2;
 pub const IP_PMTUDISC_PROBE: c_int = 3;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IP_PMTUDISC_INTERFACE: c_int = 4;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IP_PMTUDISC_OMIT: c_int = 5;
 
 // IPPROTO_IP defined in src/unix/mod.rs
@@ -943,16 +943,16 @@ pub const IPV6_RECVRTHDR: c_int = 56;
 pub const IPV6_RTHDR: c_int = 57;
 pub const IPV6_RECVDSTOPTS: c_int = 58;
 pub const IPV6_DSTOPTS: c_int = 59;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IPV6_RECVPATHMTU: c_int = 60;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IPV6_PATHMTU: c_int = 61;
-#[cfg(not(target_env = "uclibc"))]
+#[cfg(not(all(target_os = "l4re", target_env = "uclibc")))]
 pub const IPV6_DONTFRAG: c_int = 62;
 pub const IPV6_RECVTCLASS: c_int = 66;
 pub const IPV6_TCLASS: c_int = 67;
 cfg_if! {
-    if #[cfg(not(target_env = "uclibc"))] {
+    if #[cfg(not(all(target_os = "l4re", target_env = "uclibc")))] {
         pub const IPV6_AUTOFLOWLABEL: c_int = 70;
         pub const IPV6_ADDR_PREFERENCES: c_int = 72;
         pub const IPV6_MINHOPCOUNT: c_int = 73;
@@ -1220,7 +1220,7 @@ pub const __WALL: c_int = 0x40000000;
 pub const __WCLONE: c_int = 0x80000000;
 
 cfg_if! {
-    if #[cfg(not(target_env = "uclibc"))] {
+    if #[cfg(not(all(target_os = "l4re", target_env = "uclibc")))] {
         pub const SPLICE_F_MOVE: c_uint = 0x01;
         pub const SPLICE_F_NONBLOCK: c_uint = 0x02;
         pub const SPLICE_F_MORE: c_uint = 0x04;