gnu: Update F_GETLK for gnu_file_offset_bits64

gnu_file_offset_bits64 means _FILE_OFFSET_BITS=64.

(backport <rust-lang#4345>)
(cherry picked from commit 862ba8a)

Author: snogge

src/unix/linux_like/linux/gnu/b32/arm/mod.rs

@@ -397,7 +397,13 @@ pub const MCL_ONFAULT: c_int = 0x0004;
 pub const POLLWRNORM: c_short = 0x100;
 pub const POLLWRBAND: c_short = 0x200;
 
-pub const F_GETLK: c_int = 5;
+cfg_if! {
+    if #[cfg(gnu_file_offset_bits64)] {
+        pub const F_GETLK: c_int = 12;
+    } else {
+        pub const F_GETLK: c_int = 5;
+    }
+}
 pub const F_GETOWN: c_int = 9;
 pub const F_SETOWN: c_int = 8;
 

src/unix/linux_like/linux/gnu/b32/mips/mod.rs

@@ -745,7 +745,13 @@ pub const MAP_HUGETLB: c_int = 0x080000;
 
 pub const EFD_NONBLOCK: c_int = 0x80;
 
-pub const F_GETLK: c_int = 14;
+cfg_if! {
+    if #[cfg(gnu_file_offset_bits64)] {
+        pub const F_GETLK: c_int = 33;
+    } else {
+        pub const F_GETLK: c_int = 14;
+    }
+}
 pub const F_GETOWN: c_int = 23;
 pub const F_SETOWN: c_int = 24;
 

src/unix/linux_like/linux/gnu/b32/powerpc.rs

@@ -301,7 +301,13 @@ pub const MCL_ONFAULT: c_int = 0x8000;
 pub const POLLWRNORM: c_short = 0x100;
 pub const POLLWRBAND: c_short = 0x200;
 
-pub const F_GETLK: c_int = 5;
+cfg_if! {
+    if #[cfg(gnu_file_offset_bits64)] {
+        pub const F_GETLK: c_int = 12;
+    } else {
+        pub const F_GETLK: c_int = 5;
+    }
+}
 pub const F_GETOWN: c_int = 9;
 pub const F_SETOWN: c_int = 8;
 

src/unix/linux_like/linux/gnu/b32/x86/mod.rs

@@ -499,7 +499,13 @@ pub const SA_NOCLDWAIT: c_int = 0x00000002;
 pub const SOCK_STREAM: c_int = 1;
 pub const SOCK_DGRAM: c_int = 2;
 
-pub const F_GETLK: c_int = 5;
+cfg_if! {
+    if #[cfg(gnu_file_offset_bits64)] {
+        pub const F_GETLK: c_int = 12;
+    } else {
+        pub const F_GETLK: c_int = 5;
+    }
+}
 pub const F_GETOWN: c_int = 9;
 pub const F_SETOWN: c_int = 8;