Kernel & Userland: Allow to mount image files formatted with Ext2FS

Author: https://github.com/supercomputer7
Commit: a60ea79a41
Pull-request: https://github.com/SerenityOS/serenity/pull/1513
Issue: https://github.com/SerenityOS/serenity/issues/1351
Reviewed-by: https://github.com/bugaevc

Libraries/LibC/unistd.h

@@ -129,7 +129,7 @@ int fchown(int fd, uid_t, gid_t);
 int ftruncate(int fd, off_t length);
 int halt();
 int reboot();
-int mount(const char* source, const char* target, const char* fs_type, int flags);
+int mount(int source_fd, const char* target, const char* fs_type, int flags);
 int umount(const char* mountpoint);
 int pledge(const char* promises, const char* execpromises);
 int unveil(const char* path, const char* permissions);