Fix flex error in mdssvc
[4440/4495] Compiling bin/default/source3/rpc_server/mdssvc/sparql_lexer.lex.c ../../source3/rpc_server/mdssvc/sparql_lexer.l:26: error: "yyalloc" redefined [-Werror] 26 | #define yyalloc SMB_MALLOC
Looks like the dirty redefine trick doesn't work anymore with newer flex versions. According to the flex manual the right thing to do is to provide own functions for yyalloc and yyrealloc when passing the options "noyyalloc noyyrealloc".