disas/nanomips: Remove #include <sstream>

<sstream> is a C++ library and it's not used by disassembler.

Signed-off-by: Milica Lazarevic <milica.lazarevic@syrmia.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220912122635.74032-13-milica.lazarevic@syrmia.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
diff --git a/disas/nanomips.cpp b/disas/nanomips.cpp
index 7d09fd1..4b49630 100644
--- a/disas/nanomips.cpp
+++ b/disas/nanomips.cpp
@@ -32,7 +32,6 @@
 
 #include <cstring>
 #include <stdexcept>
-#include <sstream>
 #include <stdio.h>
 #include <stdarg.h>