DynamicLoader/LibC: lazy malloc environ

This allows DynamicLoader to just set the value of global environ symbol
without libc needing to malloc it at startup

userspace/libraries/LibC/unistd.cpp

@@ -16,31 +16,12 @@
 #include <termios.h>
 #include <unistd.h>
 
-char** __environ;
-extern char** environ __attribute__((weak, alias("__environ")));
+extern "C" char** environ;
 
 extern "C" void _init_libc(char** _environ)
 {
-	static bool is_initialized = false;
-	if (is_initialized)
-		return;
-	is_initialized = true;
-
-	if (!_environ)
-		return;
-
-	size_t env_count = 0;
-	while (_environ[env_count])
-		env_count++;
-
-	environ = (char**)malloc(sizeof(char*) * env_count + 1);
-	for (size_t i = 0; i < env_count; i++)
-	{
-		size_t bytes = strlen(_environ[i]) + 1;
-		environ[i] = (char*)malloc(bytes);
-		memcpy(environ[i], _environ[i], bytes);
-	}
-	environ[env_count] = nullptr;
+	if (::environ == nullptr)
+		::environ = environ;
 }
 
 void _exit(int status)