more netbsd support.

src/cmd/9term/NetBSD.c

@@ -0,0 +1 @@
+#include "bsdpty.c"

src/lib9/dirread.c

@@ -18,7 +18,7 @@ mygetdents(int fd, struct dirent *buf, int n)
 	nn = getdirentries(fd, (void*)buf, n, &off);
 	return nn;
 }
-#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__)
+#elif defined(__APPLE__) || defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__)
 static int
 mygetdents(int fd, struct dirent *buf, int n)
 {

src/libmach/NetBSD.c

@@ -0,0 +1 @@
+#include "FreeBSD.c"

src/libthread/NetBSD.c

@@ -0,0 +1,2 @@
+#include "Linux.c"
+

src/libthread/NetBSDasm.s

@@ -0,0 +1,7 @@
+.globl _tas
+_tas:
+	movl $0xCAFEBABE, %eax
+	movl 4(%esp), %ecx
+	xchgl %eax, 0(%ecx)
+	ret
+