Use standard shared library versioning.

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

Index: gettext-tools/src/Makefile.in
--- gettext-tools/src/Makefile.in.orig
+++ gettext-tools/src/Makefile.in
@@ -3936,7 +3936,7 @@ cldr_plurals_LDADD = libgettextsrc.la $(LDADD)
 # Need @LTLIBINTL@ because many source files use gettext().
 # Need @LTLIBICONV@ because po-charset.c, po-lex.c, msgl-iconv.c, write-po.c
 # use iconv().
-libgettextsrc_la_LDFLAGS = -release @VERSION@ \
+libgettextsrc_la_LDFLAGS = \
 	../gnulib-lib/libgettextlib.la $(LTLIBUNISTRING) \
 	$(LT_LIBTEXTSTYLE) @LTLIBINTL@ @LTLIBICONV@ -lc -no-undefined \
 	$(am__append_3) $(am__append_5) $(am__append_7)
@@ -5398,7 +5398,7 @@ uninstall-am: uninstall-binPROGRAMS uninstall-libLTLIB
 @USE_INSTALLED_LIBTEXTSTYLE_FALSE@	  $(MAKE) install-nobase_includeHEADERS install-nobase_nodist_includeHEADERS includedir="$$here"
 
 # No need to install libgettextsrc.a, except on AIX.
-install-exec-hook: install-exec-clean
+install-exec-hook:
 install-exec-clean:
 	case "@host_os@" in \
 	  aix*) ;; \