Fix regressions in travis Cpp tests #2907
Merged
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The testcase org.antlr.v4.test.runtime.cpp.TestParserExec was failing after #2806 removed duplicate semicolons from the declarations in generated Cpp header files.
The bug was triggered by TestParserExec because it includes a grammar with alternative labels:
Grammars without alternative labels (most?) were not affected.
The templates for StructDeclHeader and AltLabelStructDeclHeader differed in whether they appended semicolons to attributes:
StructDeclHeader:
<attrs: {a | <a>;}; separator="\n">
AltLabelStructDeclHeader: git
<attrs: {a | <a>}; separator = "\n">