Revert "cu11 build threads"

This reverts commit c3aa259. (+2 squashed commit)

Squashed commit:

[bf2f7e7] missing include

[c3aa259] cu11 build threads

src/llama-vocab.cpp

@@ -11,6 +11,7 @@
 #include <forward_list>
 #include <queue>
 #include <sstream>
+#include <regex>
 
 //
 // helpers