[C++] Mingw. Link errors in Release configuration.

[ArsenyVelichko]

I tried to build my C++ application together with the corresponding ANTLR-runtime library under mingw 9.0 and encountered the following link errors in the Release configuration:

C:/Qt/Tools/mingw900_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: 
CMakeFiles/RailDSL.dir/antlr/MetaGrammar/MetaGrammarLexer.cpp.obj:MetaGrammarLexer.cpp:(.text+0x714):
undefined reference to `antlr4::atn::LexerATNSimulator::SimState::~SimState()'
C:/Qt/Tools/mingw900_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe:
CMakeFiles/RailDSL.dir/antlr/MetaGrammar/MetaGrammarLexer.cpp.obj:MetaGrammarLexer.cpp:
(.text$_ZN6antlr43atn17LexerATNSimulatorD0Ev[_ZN6antlr43atn17LexerATNSimulatorD0Ev]+0x1c): 
undefined reference to `antlr4::atn::LexerATNSimulator::SimState::~SimState()'
C:/Qt/Tools/mingw900_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: 
CMakeFiles/RailDSL.dir/antlr/MetaGrammar/MetaGrammarParser.cpp.obj:MetaGrammarParser.cpp:(.text+0x3e56):
undefined reference to `antlr4::atn::LexerATNSimulator::SimState::~SimState()'
C:/Qt/Tools/mingw900_64/bin/../lib/gcc/x86_64-w64-mingw32/11.2.0/../../../../x86_64-w64-mingw32/bin/ld.exe: 
CMakeFiles/RailDSL.dir/antlr/MetaGrammar/MetaGrammarParser.cpp.obj:MetaGrammarParser.cpp:(.text+0x3ed6):
undefined reference to `antlr4::atn::LexerATNSimulator::SimState::~SimState()'

Referring to the LexerATNSimulator.h header file, I noticed that the ANTLR4CPP_PUBLIC macro was missing from the nested class.

antlr4/runtime/Cpp/runtime/src/atn/LexerATNSimulator.h

Lines 18 to 20 in ad29539

	class ANTLR4CPP_PUBLIC LexerATNSimulator : public ATNSimulator {
	protected:
	class SimState {

After adding this macro, link errors disappeared.