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qwsv: setfcr for ignored fp exceptions

--- a/qw/qwsv.c

+++ b/qw/qwsv.c

@@ -53,6 +53,8 @@

 	netadr_t *a;

 	svonly = 1;

+	/* ignore fp exceptions, assumed by code */

+	setfcr(getfcr() & ~(FPOVFL|FPUNFL|FPINVAL|FPZDIV));

 	COM_InitArgv (argc, argv);

 	initparm(&q);

 	if((echan = chancreate(sizeof(int), 1)) == nil