LibC: Remove now redundant NO_TLS guards

Since DynamicLoader is compiled with -fdata-sections and --gc-sections,
unused thread_local variables won't create TLS section in it anymore.

Userland/Libraries/LibC/dlfcn.cpp

@@ -17,13 +17,8 @@
 [[gnu::weak]] Result<void, DlErrorMessage> __dladdr(void const*, Dl_info*) asm("__dladdr");
 
 // FIXME: use thread_local and a String once TLS works
-#ifdef NO_TLS
-char* s_dlerror_text = NULL;
-bool s_dlerror_retrieved = false;
-#else
 __thread char* s_dlerror_text = NULL;
 __thread bool s_dlerror_retrieved = false;
-#endif
 
 static void store_error(ByteString const& error)
 {

Userland/Libraries/LibC/netdb.cpp

@@ -19,11 +19,7 @@
 
 extern "C" {
 
-#ifdef NO_TLS
-int h_errno;
-#else
 __thread int h_errno;
-#endif
 
 static hostent __gethostbyname_buffer;
 static in_addr_t __gethostbyname_address;

Userland/Libraries/LibC/netdb.h

@@ -55,11 +55,7 @@ struct protoent* getprotobynumber(int proto);
 struct protoent* getprotoent(void);
 void setprotoent(int stay_open);
 
-#ifdef NO_TLS
-extern int h_errno;
-#else
 extern __thread int h_errno;
-#endif
 
 #define HOST_NOT_FOUND 101
 #define NO_DATA 102