Use standard shared library versioning.

Index: gettext-tools/gnulib-lib/Makefile.in
--- gettext-tools/gnulib-lib/Makefile.in.orig
+++ gettext-tools/gnulib-lib/Makefile.in
@@ -5544,7 +5544,7 @@ libgettextlib_la_LDFLAGS = $(AM_LDFLAGS) -no-undefined
 	$(LTLIBINTL) $(LTLIBUNISTRING) $(MBRTOWC_LIB) \
 	$(POSIX_SPAWN_LIB) $(POW_LIBM) $(QCOPY_ACL_LIB) $(SERVENT_LIB) \
 	$(SETLOCALE_LIB) $(SETLOCALE_NULL_LIB) @INTL_MACOSX_LIBS@ \
-	-release @VERSION@ $(am__append_40) $(LTLIBXML) $(LTLIBICONV) \
+	$(am__append_40) $(LTLIBXML) $(LTLIBICONV) \
 	$(LTLIBICONV) $(am__append_194) $(am__append_195)
 
 # Use this preprocessor expression to decide whether #include_next works.