Implement builders to build Boost from source code

tests/sources/main.cpp

@@ -0,0 +1,13 @@
+#include <boost/algorithm/string.hpp>
+#include <string>
+#include <iostream>
+
+using namespace boost::algorithm;
+
+int main()
+{
+  std::string s = "Boost C++ Libraries";
+  std::cout << to_upper_copy(s) << '\n';
+
+  return 0;
+}