Extract fcntl to <bits/fcntl.h>.

Bug: http://b/28067717
Change-Id: Id8c19056244660a6e0276a5614282af8d41fbe1e
diff --git a/libc/include/bits/fcntl.h b/libc/include/bits/fcntl.h
new file mode 100644
index 0000000..90f933c
--- /dev/null
+++ b/libc/include/bits/fcntl.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _BITS_FCNTL_H_
+#define _BITS_FCNTL_H_
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+extern int fcntl(int, int, ...);
+
+__END_DECLS
+
+#endif
diff --git a/libc/include/fcntl.h b/libc/include/fcntl.h
index 9d15e92..5967903 100644
--- a/libc/include/fcntl.h
+++ b/libc/include/fcntl.h
@@ -36,6 +36,8 @@
 #include <linux/stat.h>
 #include <linux/uio.h>
 
+#include <bits/fcntl.h>
+
 #if defined(__USE_GNU) || defined(__USE_BSD)
 #include <bits/lockf.h>
 #endif
@@ -63,7 +65,6 @@
 
 extern int creat(const char*, mode_t);
 extern int creat64(const char*, mode_t);
-extern int fcntl(int, int, ...);
 extern int openat(int, const char*, int, ...);
 extern int openat64(int, const char*, int, ...);
 extern int open(const char*, int, ...);
diff --git a/libc/include/unistd.h b/libc/include/unistd.h
index 2d62c1f..0e5fcb0 100644
--- a/libc/include/unistd.h
+++ b/libc/include/unistd.h
@@ -35,6 +35,7 @@
 #include <sys/select.h>
 #include <sys/sysconf.h>
 
+#include <bits/fcntl.h>
 #include <bits/lockf.h>
 #include <bits/posix_limits.h>
 
@@ -161,7 +162,6 @@
 extern int dup(int __oldfd);
 extern int dup2(int __oldfd, int __newfd);
 extern int dup3(int __oldfd, int __newfd, int __flags) __INTRODUCED_IN(21);
-extern int fcntl(int __fd, int __cmd, ...);
 extern int ioctl(int __fd, int __request, ...);
 extern int fsync(int __fd);
 extern int fdatasync(int __fd) __INTRODUCED_IN(9);