fix: add integral typdefs to hashing/**

hashing/md5.cpp

@@ -41,6 +41,7 @@
 #include <algorithm>  /// Used for std::copy
 #include <array>      /// Used for std::array
 #include <cassert>    /// Used for assert
+#include <cstdint>    /// for integral typedefs
 #include <cstring>    /// Used for std::memcopy
 #include <iostream>   /// Used for IO operations
 #include <string>     /// Used for strings

hashing/sha1.cpp

@@ -32,6 +32,7 @@
 #include <algorithm>  /// For std::copy
 #include <array>      /// For std::array
 #include <cassert>    /// For assert
+#include <cstdint>    /// for integral typedefs
 #include <cstring>    /// For std::memcopy
 #include <iostream>   /// For IO operations
 #include <string>     /// For strings