ohos: Don't emit duplicate lfs64 definitions

The musl module is enabled on ohos, so these are duplicates.

(backport <#4804>)
(cherry picked from commit b30e714)

Author: tgross35

src/unix/linux_like/linux/mod.rs

@@ -1187,7 +1187,7 @@ s! {
         size: [u8; crate::__SIZEOF_PTHREAD_BARRIERATTR_T],
     }
 
-    #[cfg(not(target_env = "musl"))]
+    #[cfg(not(any(target_env = "musl", target_env = "ohos")))]
     #[repr(align(8))]
     pub struct fanotify_event_metadata {
         pub event_len: __u32,
@@ -6752,7 +6752,7 @@ extern "C" {
 //
 // * musl has 64-bit versions only so aliases the LFS64 symbols to the standard ones
 cfg_if! {
-    if #[cfg(not(target_env = "musl"))] {
+    if #[cfg(not(any(target_env = "musl", target_env = "ohos")))] {
         extern "C" {
             pub fn fallocate64(fd: c_int, mode: c_int, offset: off64_t, len: off64_t) -> c_int;
             pub fn fgetpos64(stream: *mut crate::FILE, ptr: *mut fpos64_t) -> c_int;

src/unix/linux_like/mod.rs

@@ -2071,7 +2071,11 @@ extern "C" {
 // * musl and Emscripten has 64-bit versions only so aliases the LFS64 symbols to the standard ones
 // * ulibc doesn't have preadv64/pwritev64
 cfg_if! {
-    if #[cfg(not(any(target_env = "musl", target_os = "emscripten")))] {
+    if #[cfg(not(any(
+        target_env = "musl",
+        target_env = "ohos",
+        target_os = "emscripten",
+    )))] {
         extern "C" {
             pub fn fstatfs64(fd: c_int, buf: *mut statfs64) -> c_int;
             pub fn statvfs64(path: *const c_char, buf: *mut statvfs64) -> c_int;
@@ -2131,7 +2135,8 @@ cfg_if! {
     if #[cfg(not(any(
         target_env = "uclibc",
         target_env = "musl",
-        target_os = "emscripten"
+        target_env = "ohos",
+        target_os = "emscripten",
     )))] {
         extern "C" {
             pub fn preadv64(