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kernel: dont copy fpsave on fork, simplify freeing waitq in pexit(), remove unused semlock from Proc sturcure

--- a/sys/src/9/pc/trap.c

+++ b/sys/src/9/pc/trap.c

@@ -734,10 +734,6 @@

 	scallnr = ureg->ax;

 	up->scallnr = scallnr;

-	if(scallnr == RFORK && up->fpstate == FPactive){

-		fpsave(&up->fpsave);

-		up->fpstate = FPinactive;

-	}

 	spllo();

 	up->nerrlab = 0;

--- a/sys/src/9/port/portdat.h

+++ b/sys/src/9/port/portdat.h

@@ -421,7 +421,6 @@

 	Pte	**map;

 	int	mapsize;

 	Pte	*ssegmap[SSEGMAPSIZE];

-	Lock	semalock;

 	Sema	sema;

 	ulong	mark;		/* portcountrefs */

 };

--- a/sys/src/9/port/proc.c

+++ b/sys/src/9/port/proc.c

@@ -1067,7 +1067,7 @@

 	Proc *p;

 	Segment **s, **es;

 	long utime, stime;

-	Waitq *wq, *f, *next;

+	Waitq *wq;

 	Fgrp *fgrp;

 	Egrp *egrp;

 	Rgrp *rgrp;

@@ -1178,9 +1178,9 @@

 	wakeup(&up->waitr);

 	unlock(&up->exl);

-	for(f = up->waitq; f; f = next) {

-		next = f->next;

-		free(f);

+	while((wq = up->waitq) != 0){

+		up->waitq = wq->next;

+		free(wq);

 	}

 	/* release debuggers */

@@ -1374,7 +1374,6 @@

 	p->kp = 1;

 	p->noswap = 1;

-	p->fpsave = up->fpsave;

 	p->scallnr = up->scallnr;

 	p->s = up->s;

 	p->nerrlab = 0;

-- 

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