move atofq.v to a separate module

vlib/builtin/builtin.v

@@ -172,3 +172,27 @@ pub fn is_atty(fd int) int {
 	}
 }
 
+/*
+fn C.va_start()
+fn C.va_end()
+fn C.vsnprintf() int
+fn C.vsprintf() int
+
+pub fn str2_(fmt charptr, ...) string {
+       argptr := C.va_list{}
+        C.va_start(argptr, fmt)
+        len := C.vsnprintf(0, 0, fmt, argptr) + 1
+C.va_end(argptr)
+        buf := malloc(len)
+        C.va_start(argptr, fmt)
+        C.vsprintf(charptr(buf), fmt, argptr)
+        C.va_end(argptr)
+//#ifdef DEBUG_ALLOC
+//        puts("_STR:");
+//        puts(buf);
+//#endif
+        return tos2(buf)
+}
+*/
+
+