[test] Don't include renameat2 on Fuchsia builds

PiperOrigin-RevId: 829021243

Author: Jeff-A-Martin

test/util/fs_util.cc

@@ -737,10 +737,12 @@ ::testing::Matcher<mode_t> PermissionIs(mode_t want) {
   return MakeMatcher(new ModePermissionMatcher(want));
 }
 
+#ifndef __Fuchsia__
 int renameat2(int olddirfd, const char* oldpath, int newdirfd,
               const char* newpath, unsigned int flags) {
   return syscall(SYS_renameat2, olddirfd, oldpath, newdirfd, newpath, flags);
 }
+#endif  // __Fuchsia__
 
 }  // namespace testing
 }  // namespace gvisor

test/util/fs_util.h

@@ -43,6 +43,8 @@ constexpr int kOLargeFile = 00400000;
 // build environments.
 #define OVERLAYFS_SUPER_MAGIC 0x794c7630
 
+// Fuchsia does not support renameat2.
+#ifndef __Fuchsia__
 #ifndef SYS_renameat2
 #if defined(__x86_64__)
 #define SYS_renameat2 316
@@ -59,6 +61,7 @@ constexpr int kOLargeFile = 00400000;
 
 int renameat2(int olddirfd, const char* oldpath, int newdirfd,
               const char* newpath, unsigned int flags);
+#endif  // __Fuchsia__
 
 // Returns a status or the current working directory.
 PosixErrorOr<std::string> GetCWD();