Ensure that a bool is stored in 'eol'
oss-fuzz: Issue 24875: bind9:isc_lex_getmastertoken_fuzzer: Invalid-bool-value in isc_lex_getmastertoken.c
oss-fuzz: Issue 24875: bind9:isc_lex_getmastertoken_fuzzer: Invalid-bool-value in isc_lex_getmastertoken.c