[PATCH 0/1] MR100: configure: Declare LFLAGS and YFLAGS as precious.

[Zebediah Figura (＠zfigura)]

Normally AC_PROG_LEX and AC_PROG_YACC do this, but we demand flex and bison specifically.

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https://gitlab.winehq.org/wine/vkd3d/-/merge_requests/100