Kernel+LibC+Userland: Support mounting other kinds of filesystems

Author: https://github.com/bugaevc
Commit: 425c356288
Pull-request: https://github.com/SerenityOS/serenity/pull/456
Reviewed-by: https://github.com/awesomekling ✅

Libraries/LibC/unistd.cpp

@@ -551,9 +551,9 @@ int reboot()
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
-int mount(const char* device, const char* mountpoint)
+int mount(const char* device, const char* mountpoint, const char* fstype)
 {
-    int rc = syscall(SC_mount, device, mountpoint);
+    int rc = syscall(SC_mount, device, mountpoint, fstype);
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }