[PATCH] Fix a missing include of <string>

[Martin Liška]

Hi.

Since GCC revision r272011 I see following error:

make[9]: Entering directory '/home/marxin/Programming/binutils/gdb/gdbserver/build-gnulib-gdbserver/import'
In file included from debug.h:29,
                 from dirsearch.cc:31:
errors.h:87:50: error: ‘string’ in namespace ‘std’ does not name a type
   87 |   undefined_symbol(const Symbol* sym, const std::string& location);
      |                                                  ^~~~~~
errors.h:29:1: note: ‘std::string’ is defined in header ‘<string>’; did you forget to ‘#include <string>’?
   28 | #include "gold-threads.h"
  +++ |+#include <string>
   29 | 

The patch is fixing that.

Ready for trunk?
Thanks,
Martin
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