Use standard shared library versioning.

Do not remove static library after building.
This was also a race if MAKE_JOBS > 1.

Index: gettext-tools/gnulib-lib/Makefile.in
--- gettext-tools/gnulib-lib/Makefile.in.orig
+++ gettext-tools/gnulib-lib/Makefile.in
@@ -4612,7 +4612,7 @@ libgettextlib_la_LDFLAGS = $(AM_LDFLAGS) -no-undefined
 	$(LTLIBC32CONV) $(LTLIBICONV) $(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_36) \
+	@INTL_MACOSX_LIBS@ $(am__append_36) \
 	$(am__append_52) $(LTLIBICONV) $(LTLIBICONV) $(am__append_171) \
 	$(am__append_172)
 
@@ -6912,7 +6912,7 @@ fcntl.h: fcntl.in.h $(top_builddir)/config.status $(CX
 @GL_GENERATE_GETOPT_CDEFS_H_FALSE@	rm -f $@
 
 # No need to install libgettextlib.a, except on AIX.
-install-exec-local: install-libLTLIBRARIES install-exec-clean
+install-exec-local: install-libLTLIBRARIES
 install-exec-clean:
 	case "@host_os@" in \
 	  aix*) ;; \