libmach,lib9: override unused parameter warnings (fixes windows build)

R=golang-dev, dave
CC=golang-dev
https://golang.org/cl/11620044

src/lib9/_p9dir.c

@@ -43,6 +43,9 @@ _p9dir(struct stat *lst, struct stat *st, char *name, Dir *d, char **str, char *
 	char tmp[20];
 	int sz, fd;
 
+#ifdef _WIN32
+	USED(lst);
+#endif
 	fd = -1;
 	USED(fd);
 	sz = 0;

src/lib9/dirfwstat.c

@@ -48,6 +48,8 @@ futimes(int fd, struct timeval *tv)
 static int
 futimes(int fd, struct timeval *tv)
 {
+	USED(fd);
+	USED(tv);
 	werrstr("futimes not available");
 	return -1;
 }

src/lib9/windows.c

@@ -14,6 +14,7 @@ fork(void)
 int
 p9rfork(int flags)
 {
+	USED(flags);
 	return -1;
 }
 

src/libmach/windows.c

@@ -7,6 +7,8 @@
 int
 ctlproc(int pid, char *msg)
 {
+	USED(pid);
+	USED(msg);
 	sysfatal("ctlproc unimplemented in Windows");
 	return -1;
 }
@@ -14,6 +16,7 @@ ctlproc(int pid, char *msg)
 char*
 proctextfile(int pid)
 {
+	USED(pid);
 	sysfatal("proctextfile unimplemented in Windows");
 	return nil;
 }
@@ -21,6 +24,7 @@ proctextfile(int pid)
 char*
 procstatus(int pid)
 {
+	USED(pid);
 	sysfatal("procstatus unimplemented in Windows");
 	return nil;
 }
@@ -28,6 +32,8 @@ procstatus(int pid)
 Map*
 attachproc(int pid, Fhdr *fp)
 {
+	USED(pid);
+	USED(fp);
 	sysfatal("attachproc unimplemented in Windows");
 	return nil;
 }
@@ -35,12 +41,16 @@ attachproc(int pid, Fhdr *fp)
 void
 detachproc(Map *m)
 {
+	USED(m);
 	sysfatal("detachproc unimplemented in Windows");
 }
 
 int
 procthreadpids(int pid, int *p, int np)
 {
+	USED(pid);
+	USED(p);
+	USED(np);
 	sysfatal("procthreadpids unimplemented in Windows");
 	return -1;
 }
@@ -59,6 +69,10 @@ pread(int fd, void *buf, int count, int offset)
 int 
 pwrite(int fd, void *buf, int count, int offset)
 {
+	USED(fd);
+	USED(buf);
+	USED(count);
+	USED(offset);
 	sysfatal("pwrite unimplemented in Windows");
 	return -1;
 }
@@ -66,6 +80,8 @@ pwrite(int fd, void *buf, int count, int offset)
 int 
 nanosleep(const struct timespec *rqtp, struct timespec *rmtp)
 {
+	USED(rqtp);
+	USED(rmtp);
 	sysfatal("nanosleep unimplemented in Windows");
 	return -1;
 }