linux-user/syscall.c: eliminate other explicit LFS usages

Since we alwasy build with LFS enabled, and with -D_FILE_OFFSET_BITS=64
in particular, there is no need to use 64bit versions of various system
calls and constants, regular ones will do just fine.  Eliminate a few
last uses of the following constructs in linux-user/syscall.c:
  off64_t
  ftruncate64()
  lseek64()
  pread64()
  pwrite64()

This way it can be built on systems where the 64bit variants of
everything is not defined (since the system always uses 64bit
variants), such as on recent MUSL.

Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2215
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

linux-user/syscall.c

@@ -7265,7 +7265,7 @@ static inline abi_long target_truncate64(CPUArchState *cpu_env, const char *arg1
         arg2 = arg3;
         arg3 = arg4;
     }
-    return get_errno(truncate64(arg1, target_offset64(arg2, arg3)));
+    return get_errno(truncate(arg1, target_offset64(arg2, arg3)));
 }
 #endif
 
@@ -7279,7 +7279,7 @@ static inline abi_long target_ftruncate64(CPUArchState *cpu_env, abi_long arg1,
         arg2 = arg3;
         arg3 = arg4;
     }
-    return get_errno(ftruncate64(arg1, target_offset64(arg2, arg3)));
+    return get_errno(ftruncate(arg1, target_offset64(arg2, arg3)));
 }
 #endif
 
@@ -8664,7 +8664,7 @@ static int do_getdents(abi_long dirfd, abi_long arg2, abi_long count)
     void *tdirp;
     int hlen, hoff, toff;
     int hreclen, treclen;
-    off64_t prev_diroff = 0;
+    off_t prev_diroff = 0;
 
     hdirp = g_try_malloc(count);
     if (!hdirp) {
@@ -8717,7 +8717,7 @@ static int do_getdents(abi_long dirfd, abi_long arg2, abi_long count)
              * Return what we have, resetting the file pointer to the
              * location of the first record not returned.
              */
-            lseek64(dirfd, prev_diroff, SEEK_SET);
+            lseek(dirfd, prev_diroff, SEEK_SET);
             break;
         }
 
@@ -8751,7 +8751,7 @@ static int do_getdents64(abi_long dirfd, abi_long arg2, abi_long count)
     void *tdirp;
     int hlen, hoff, toff;
     int hreclen, treclen;
-    off64_t prev_diroff = 0;
+    off_t prev_diroff = 0;
 
     hdirp = g_try_malloc(count);
     if (!hdirp) {
@@ -8793,7 +8793,7 @@ static int do_getdents64(abi_long dirfd, abi_long arg2, abi_long count)
              * Return what we have, resetting the file pointer to the
              * location of the first record not returned.
              */
-            lseek64(dirfd, prev_diroff, SEEK_SET);
+            lseek(dirfd, prev_diroff, SEEK_SET);
             break;
         }
 
@@ -11524,7 +11524,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
                 return -TARGET_EFAULT;
             }
         }
-        ret = get_errno(pread64(arg1, p, arg3, target_offset64(arg4, arg5)));
+        ret = get_errno(pread(arg1, p, arg3, target_offset64(arg4, arg5)));
         unlock_user(p, arg2, ret);
         return ret;
     case TARGET_NR_pwrite64:
@@ -11541,7 +11541,7 @@ static abi_long do_syscall1(CPUArchState *cpu_env, int num, abi_long arg1,
                 return -TARGET_EFAULT;
             }
         }
-        ret = get_errno(pwrite64(arg1, p, arg3, target_offset64(arg4, arg5)));
+        ret = get_errno(pwrite(arg1, p, arg3, target_offset64(arg4, arg5)));
         unlock_user(p, arg2, 0);
         return ret;
 #endif