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.h

@@ -100,7 +100,7 @@ int fchown(int fd, uid_t, gid_t);
 int ftruncate(int fd, off_t length);
 int halt();
 int reboot();
-int mount(const char* device, const char* mountpoint);
+int mount(const char* device, const char* mountpoint, const char* fstype);
 int umount(const char* mountpoint);
 
 enum {