Merge pull request 'epee: add missing header' (#431) from sneurlax/wownero:fix/gcc11 into master

Reviewed-on: https://git.wownero.com/wownero/wownero/pulls/431

contrib/epee/src/buffer.cpp

@@ -26,6 +26,7 @@
 // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+#include <limits>
 #include <string.h>
 #include "net/buffer.h"
 

contrib/epee/src/wipeable_string.cpp

@@ -27,6 +27,7 @@
 // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #include <boost/optional/optional.hpp>
+#include <limits>
 #include <string.h>
 #include "memwipe.h"
 #include "misc_log_ex.h"

src/wallet/wallet_rpc_helpers.h

@@ -28,6 +28,7 @@
 
 #pragma once
 
+#include <limits>
 #include <type_traits>
 
 namespace