LibC: Clean up crt0

We already set these variables and call `_init` in the dynamic linker.
As we don't care about static binaries, remove these assignments and the
call to `_init` from `_entry`.

The function referenced by DT_INIT is also not necessarily called
`_init`, so directly calling `_init` is not really correct.

`s_global_initializers_ran` and `__stack_chk_guard` are unused, so
remove them.

Userland/Libraries/LibC/crt0.cpp

@@ -14,13 +14,10 @@
 #ifndef _DYNAMIC_LOADER
 extern "C" {
 
-extern uintptr_t __stack_chk_guard;
-extern bool s_global_initializers_ran;
-
 int main(int, char**, char**);
 
 // Tell the compiler that this may be called from somewhere else.
-int _entry(int argc, char** argv, char** env) __attribute__((used));
+int _entry(int argc, char** argv) __attribute__((used));
 void _start(int, char**, char**) __attribute__((used));
 
 NAKED void _start(int, char**, char**)
@@ -37,16 +34,10 @@ NAKED void _start(int, char**, char**)
 #    endif
 }
 
-int _entry(int argc, char** argv, char** env)
+int _entry(int argc, char** argv)
 {
-    environ = env;
-    __environ_is_malloced = false;
     __begin_atexit_locking();
 
-    s_global_initializers_ran = true;
-
-    _init();
-
     int status = main(argc, argv, environ);
 
     exit(status);

Userland/Libraries/LibC/libcinit.cpp

@@ -20,7 +20,6 @@ __thread int errno_storage;
 char** environ;
 bool __environ_is_malloced;
 bool __stdio_is_initialized;
-bool s_global_initializers_ran;
 void* __auxiliary_vector;
 
 static void __auxiliary_vector_init();