Automatically integrates git build information into executables.

Usage:
func.exe -V
adnl-pong -V
validator-engine -V
and so on.
Result will be shown in the following format:
Func build information: [ Commit: d8b751d7a5, Date: 2021-02-27 14:34:41 +0200]

storage/LoadSpeed.cpp

@@ -22,7 +22,7 @@
 #include "td/utils/format.h"
 
 namespace ton {
-void LoadSpeed::add(td::size_t size, td::Timestamp now) {
+void LoadSpeed::add(std::size_t size, td::Timestamp now) {
   total_size_ += size;
   events_.push(Event{size, now});
   update(now);