Fix gdbsupport build on compilers that don't default to C++11 or above
gdbsupport fails to build with compilers that don't default to C++11 or above. gdbsupport's configure.ac is already using AX_CXX_COMPILE_STDCXX, which sets CXX_DIALECT to the -std=gnu++11 switch if necessary, but the problem is that nowhere are we using CXX_DIALECT. This fixes it. gdbsupport/ChangeLog: 2020-01-17 Pedro Alves <firstname.lastname@example.org> * Makefile.am: Append CXX_DIALECT to CXX. * Makefile.in: Regenerate.
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