autofs-5.0.7 - fix occasional build error when enable parallel compiling

From: Lan Yixun (dlan) <dennis.yxun@gmail.com>

The problem here we pass "-jX" ( X> 1) to "make", and "rpc_subs.c"
occasionally fail to compile due to it can't find "mount.h",
the root cause it that "mount.h" haven't generated by that time,
add this patch should fix this problem.
to make rpc_subs.o explicitly depend on "mount.h".

error message:

x86_64-pc-linux-gnu-gcc -O2 -pipe -march=core2  -D_REENTRANT
-D_FILE_OFFSET_BITS=64 -I/usr/include/tirp  c -D_REENTRANT
-D_FILE_OFFSET_BITS=64 -I/usr/include/tirpc -I../include -fPIC
-D_GNU_SOURCE -DAUTOFS_MA  P_DIR=\"/etc/autofs\"
-DAUTOFS_CONF_DIR=\"/etc/conf.d\" -c rpc_subs.c
rpc_subs.c:46:19: fatal error: mount.h: No such file or directory
  #include "mount.h"
                   ^
compilation terminated.
make[1]: *** [rpc_subs.o] Error 1
make[1]: *** Waiting for unfinished
jobs....

Signed-off-by: Lan Yixun (dlan) <dennis.yxun@gmail.com>
---
 lib/Makefile |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Makefile b/lib/Makefile
index 5418009..314779b 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -70,6 +70,8 @@ nss_tok.o: nss_tok.c nss_parse.tab.h
 
 nss_parse.tab.o: nss_parse.tab.c nss_parse.tab.h
 
+rpc_subs.o: mount.h
+
 install: all
 
 clean: