samba - May 2018 - build rpcclient only and static link everything but libc

Hi there,

I'm using 4.8.2 and trying to build rpcclient statically.

```
./configure --disable-python --without-ad-dc --without-acl-support
--without-ldap --without-ntvfs-fileserver --without-ads --without-pam
--bundled-libraries=talloc,tdb,pytdb,ldb,pyldb,tevent,pytevent
--with-static-modules=ALL
make
```

Then I got

```
WAF_MAKE=1 python ./buildtools/bin/waf build
Waf: Entering directory `/samba-4.8.2/bin'
Selected embedded Heimdal build
Checking project rules ...
Project rules pass
[3008/3078] Linking default/source3/rpcclient/rpcclient
default/source3/rpcclient/cmd_spoolss_1.o: In function
`cmd_spoolss_open_printer_ex':
cmd_spoolss.c:(.text+0x2ad): undefined reference to
`rpccli_spoolss_openprinter_ex'
default/source3/rpcclient/cmd_spoolss_1.o: In function
`cmd_spoolss_enum_printers':
cmd_spoolss.c:(.text+0xccb): undefined reference to
`rpccli_spoolss_enumprinters'
default/source3/rpcclient/cmd_spoolss_1.o: In function
`cmd_spoolss_enum_ports':
cmd_spoolss.c:(.text+0x110e): undefined reference to
`rpccli_spoolss_enumports'
default/source3/rpcclient/cmd_spoolss_1.o: In function
`cmd_spoolss_setprinter':
cmd_spoolss.c:(.text+0x12d0): undefined reference to
`rpccli_spoolss_openprinter_ex'
...
```

Any ideas?