[Bug build/31918] New: Error: no template named 'unordered_map' when compiling on FreeBSD 13.2

["martin at lispworks dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=31918

            Bug ID: 31918
           Summary: Error: no template named 'unordered_map' when
                    compiling on FreeBSD 13.2
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: build
          Assignee: unassigned at sourceware dot org
          Reporter: martin at lispworks dot com
  Target Milestone: ---

Created attachment 15590
  --> https://sourceware.org/bugzilla/attachment.cgi?id=15590&action=edit
Patch to include unordered_map header

Compiling on FreeBSD 13.2 with the default clang version 14.0.5 and top level
configure options --with-python=/usr/local/bin/python3.9 gives this error:

  CXX    ada-exp.o
../../binutils-gdb/gdb/ada-exp.y:100:8: error: no template named
'unordered_map' in namespace 'std'
  std::unordered_map<std::string, std::vector<ada_index_var_operation *>>
  ~~~~~^
1 error generated.

The attached patch fixes it.

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