libc: Move chmod from unistd.h to sys/stat.h

Apparently that's where it's supposed to be.

apps/chmod.cpp

@@ -1,7 +1,7 @@
 #include <os/ArgumentParser.h>
 #include <stdio.h>
 #include <stdlib.h>
-#include <unistd.h>
+#include <sys/stat.h>
 
 int main(int argc, char** argv)
 {

libc/include/sys/stat.h

@@ -18,6 +18,9 @@ extern "C"
     /* Create a special file. */
     int mknod(const char* path, mode_t mode, dev_t dev);
 
+    /* Change the mode bits of a file. */
+    int chmod(const char* path, mode_t mode);
+
 #pragma GCC push_options
 #pragma GCC diagnostic ignored "-Wshadow"
 

libc/include/unistd.h

@@ -52,9 +52,6 @@ extern "C"
     /* Set the current process' effective group ID. */
     int setegid(gid_t gid);
 
-    /* Change the mode bits of a file. */
-    int chmod(const char* path, mode_t mode);
-
     /* Change the owner and group of a file. */
     int chown(const char* path, uid_t uid, gid_t gid);
 

libc/src/sys/stat.cpp

@@ -18,6 +18,12 @@ extern "C"
         __errno_return(rc, int);
     }
 
+    int chmod(const char* path, mode_t mode)
+    {
+        long rc = syscall(SYS_chmod, path, mode);
+        __errno_return(rc, int);
+    }
+
     int stat(const char* path, struct stat* st)
     {
         long rc = syscall(SYS_fstatat, AT_FDCWD, path, st, 0);

libc/src/unistd.cpp

@@ -142,12 +142,6 @@ extern "C"
         __errno_return(rc, int);
     }
 
-    int chmod(const char* path, mode_t mode)
-    {
-        long rc = syscall(SYS_chmod, path, mode);
-        __errno_return(rc, int);
-    }
-
     int chown(const char* path, uid_t uid, gid_t gid)
     {
         long rc = syscall(SYS_chown, path, uid, gid);