Wrap all LLVM C includes

src/main.cpp

@@ -10,6 +10,10 @@
 
 gb_global Timings global_timings = {0};
 
+#if defined(LLVM_BACKEND_SUPPORT)
+#include "llvm-c/Types.h"
+#endif
+
 
 #include "parser.hpp"
 #include "checker.hpp"

src/types.cpp

@@ -1,5 +1,3 @@
-#include "llvm-c/Types.h"
-
 struct Scope;
 struct Ast;