ulc-wordbreaks-tests needs libiconv

[Tom G. Christensen]

I'm building the latest gnulib daily snapshot on i386-pc-solaris2.6 and
it fails with a link error in the testsuite:
gcc -std=gnu99  -g -O2  -L/usr/tgcware/lib -Wl,-R,/usr/tgcware/lib
-Wl,-z,ignore -o test-ulc-wordbreaks test-ulc-wordbreaks.o 
../gllib/libgnu.a -lm  
Undefined                       first referenced
 symbol                             in file
 libiconv                            ../gllib/libgnu.a(striconveh.o)
 libiconv_open                       ../gllib/libgnu.a(striconveh.o)
 libiconv_close                      ../gllib/libgnu.a(striconveh.o)
 ld: fatal: Symbol referencing errors. No output written to
 test-ulc-wordbreaks
 collect2: ld returned 1 exit status
make[4]: *** [test-ulc-wordbreaks] Error 1

It seems to be a simple case of a missing LDADD line in
modules/uniwbrk/ulc-wordbreaks-tests.

-tgc