Link test-poll against INET_PTON_LIB.

[Ralf Wildenhues]

I need this patch to avoid this failure on Solaris 10:

source='../../gltests/test-poll.c' object='test-poll.o' libtool=no \
DEPDIR=.deps depmode=none /bin/bash ../../gltests/../build-aux/depcomp \
cc -xc99=all -DHAVE_CONFIG_H -I. -I../../gltests  -I. -I../../gltests -I.. 
-I../../gltests/.. -I../gllib -I../../gltests/../gllib -D_REENTRANT  -g -c -o 
test-poll.o ../../gltests/test-poll.c
cc -xc99=all  -g  -Wl,-z,ignore -o test-poll test-poll.o ../gllib/libgnu.a 
-lsocket -lm  
Undefined                       first referenced
 symbol                             in file
inet_pton                           test-poll.o  (symbol belongs to implicit 
dependency /lib/libnsl.so.1)
ld: fatal: Symbol referencing errors. No output written to test-poll
make[4]: *** [test-poll] Error 1

Cheers,
Ralf

    Link test-poll against INET_PTON_LIB.
    
    * modules/poll-tests (test_poll_LDADD): Add $(INET_PTON_LIB),
    for inet_pton on Solaris 10.

diff --git a/modules/poll-tests b/modules/poll-tests
index 1655fab..d34107e 100644
--- a/modules/poll-tests
+++ b/modules/poll-tests
@@ -28,4 +28,4 @@ AC_CHECK_HEADERS_ONCE([unistd.h sys/wait.h])
 Makefile.am:
 TESTS += test-poll
 check_PROGRAMS += test-poll
-test_poll_LDADD = $(LDADD) @LIBSOCKET@
+test_poll_LDADD = $(LDADD) @LIBSOCKET@ $(INET_PTON_LIB)