Clean up interface to PM and VFS

- introduce new call numbers, names, and field aliases;
- initialize request messages to zero for all ABI calls;
- format callnr.h in the same way as com.h;
- redo call tables in both servers;
- remove param.h namespace pollution in the servers;
- make brk(2) go to VM directly, rather than through PM;
- remove obsolete BRK, UTIME, and WAIT calls;
- clean up path copying routine in VFS;
- move remaining system calls from libminlib to libc;
- correct some errno-related mistakes in libc routines.

Change-Id: I2d8ec5d061cd7e0b30c51ffd77aa72ebf84e2565

lib/libc/sys-minix/sync.c

@@ -2,15 +2,18 @@
 #include <lib.h>
 #include "namespace.h"
 
+#include <string.h>
+
 #ifdef __weak_alias
 __weak_alias(sync, _sync)
 #endif
 
 #include <unistd.h>
 
-void sync()
+void sync(void)
 {
   message m;
 
-  (void)(_syscall(VFS_PROC_NR, SYNC, &m));
+  memset(&m, 0, sizeof(m));
+  (void)(_syscall(VFS_PROC_NR, VFS_SYNC, &m));
 }