2 copies of taskcall.c removed

- taskcall.c is 3x in the trunk as part of libc, libsysutil and
  libsys.  It should be only part of libsys.

- only system process should be linked with libsys, therefore using
  raw _taskcall() in service.c is replaced by _syscall()

- the same for minix_rs.c

- lib/other/sys_eniop.c can go without replacement as it is part of
  syslib

lib/sysutil/Makefile.in

@@ -20,7 +20,6 @@ libsys_FILES=" \
 	fkey_ctl.c \
 	tsc_util.c \
 	report.c \
-	taskcall.c \
 	read_tsc.s \
 	read_tsc_64.c \
 	ser_putc.c \

lib/sysutil/taskcall.c

@@ -1,20 +0,0 @@
-/* _taskcall() is the same as _syscall() except it returns negative error
- * codes directly and not in errno.  This is a better interface for MM and
- * FS.
- */
-
-#include <lib.h>
-#include <minix/syslib.h>
-
-PUBLIC int _taskcall(who, syscallnr, msgptr)
-endpoint_t who;
-int syscallnr;
-register message *msgptr;
-{
-  int status;
-
-  msgptr->m_type = syscallnr;
-  status = _sendrec(who, msgptr);
-  if (status != 0) return(status);
-  return(msgptr->m_type);
-}