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posix: fix builtin_fns.h sed expression

--- a/Makefile

+++ b/Makefile

@@ -40,7 +40,7 @@

 	sed 's,\\,\\\\,g;s,",\\",g;s,^,",g;s,$$,\\n",g' flisp.boot >$@

 builtin_fns.h:

-	sed -n 's/^BUILTIN[_]?\((".*\)/BUILTIN_FN\1/gp' *.c >$@

+	sed -nE 's/^BUILTIN[_]?(\(".*)/BUILTIN_FN\1/gp' *.c >$@

 ${LLT}:

 	${MAKE} -C llt CFLAGS="${CFLAGS} -I../posix" CC="${CC}"