Use standard C99 (and Qt) types for 64-bit integers

src/qt/bitcoinstrings.cpp

@@ -82,4 +82,4 @@ QT_TRANSLATE_NOOP("bitcoin-core", ""
 "Warning: Please check that your computer's date and time are correct.  If "
 "your clock is wrong Bitcoin will not work properly."),
 QT_TRANSLATE_NOOP("bitcoin-core", "beta"),
-};
+};