[libc][NFC][Obvious] Fix few header guards in src/threads.

GitOrigin-RevId: c7614faa05fa276f34626748af7f975630e46097
diff --git a/src/threads/mtx_init.h b/src/threads/mtx_init.h
index d85089f..7eed5ec 100644
--- a/src/threads/mtx_init.h
+++ b/src/threads/mtx_init.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_SRC_THREADS_LINUX_MTX_INIT_H
-#define LLVM_LIBC_SRC_THREADS_LINUX_MTX_INIT_H
+#ifndef LLVM_LIBC_SRC_THREADS_MTX_INIT_H
+#define LLVM_LIBC_SRC_THREADS_MTX_INIT_H
 
 #include "include/threads.h"
 
@@ -17,4 +17,4 @@
 
 } // namespace __llvm_libc
 
-#endif // LLVM_LIBC_SRC_THREADS_LINUX_MTX_INIT_H
+#endif // LLVM_LIBC_SRC_THREADS_MTX_INIT_H
diff --git a/src/threads/mtx_lock.h b/src/threads/mtx_lock.h
index fee6285..5086f77 100644
--- a/src/threads/mtx_lock.h
+++ b/src/threads/mtx_lock.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_SRC_THREADS_LINUX_MTX_LOCK_H
-#define LLVM_LIBC_SRC_THREADS_LINUX_MTX_LOCK_H
+#ifndef LLVM_LIBC_SRC_THREADS_MTX_LOCK_H
+#define LLVM_LIBC_SRC_THREADS_MTX_LOCK_H
 
 #include "include/threads.h"
 
@@ -17,4 +17,4 @@
 
 } // namespace __llvm_libc
 
-#endif // LLVM_LIBC_SRC_THREADS_LINUX_MTX_LOCK_H
+#endif // LLVM_LIBC_SRC_THREADS_MTX_LOCK_H
diff --git a/src/threads/mtx_unlock.h b/src/threads/mtx_unlock.h
index b7ae913..55f0b4a 100644
--- a/src/threads/mtx_unlock.h
+++ b/src/threads/mtx_unlock.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_SRC_THREADS_LINUX_MTX_UNLOCK_H
-#define LLVM_LIBC_SRC_THREADS_LINUX_MTX_UNLOCK_H
+#ifndef LLVM_LIBC_SRC_THREADS_MTX_UNLOCK_H
+#define LLVM_LIBC_SRC_THREADS_MTX_UNLOCK_H
 
 #include "include/threads.h"
 
@@ -17,4 +17,4 @@
 
 } // namespace __llvm_libc
 
-#endif // LLVM_LIBC_SRC_THREADS_LINUX_MTX_UNLOCK_H
+#endif // LLVM_LIBC_SRC_THREADS_MTX_UNLOCK_H
diff --git a/src/threads/thrd_create.h b/src/threads/thrd_create.h
index 2ad3c7c..d2bb7df 100644
--- a/src/threads/thrd_create.h
+++ b/src/threads/thrd_create.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_SRC_THREADS_LINUX_THRD_CREATE_H
-#define LLVM_LIBC_SRC_THREADS_LINUX_THRD_CREATE_H
+#ifndef LLVM_LIBC_SRC_THREADS_THRD_CREATE_H
+#define LLVM_LIBC_SRC_THREADS_THRD_CREATE_H
 
 #include "include/threads.h"
 
@@ -17,4 +17,4 @@
 
 } // namespace __llvm_libc
 
-#endif // LLVM_LIBC_SRC_THREADS_LINUX_THRD_CREATE_H
+#endif // LLVM_LIBC_SRC_THREADS_THRD_CREATE_H
diff --git a/src/threads/thrd_join.h b/src/threads/thrd_join.h
index 9df4644..fc36503 100644
--- a/src/threads/thrd_join.h
+++ b/src/threads/thrd_join.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_LIBC_SRC_THREADS_LINUX_THRD_JOIN_H
-#define LLVM_LIBC_SRC_THREADS_LINUX_THRD_JOIN_H
+#ifndef LLVM_LIBC_SRC_THREADS_THRD_JOIN_H
+#define LLVM_LIBC_SRC_THREADS_THRD_JOIN_H
 
 #include "include/threads.h"
 
@@ -17,4 +17,4 @@
 
 } // namespace __llvm_libc
 
-#endif // LLVM_LIBC_SRC_THREADS_LINUX_THRD_JOIN_H
+#endif // LLVM_LIBC_SRC_THREADS_THRD_JOIN_H