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Fix FTBFS with GCC 15

Henrique F. Simoesrequested to merge
henriquesimoes/libconfig:gcc-15 into master

There are two internal forward declarations which hadn't a proper parameter definition. Import the upstream patch fixing this issue, so the code is conformant with C23 and builds with the default C standard from GCC 15.

Because this fix happens on the yacc source file, install both flex(1) and bison(1) so that the grammar.c file is properly regenerated.

Closes: #1097173

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