configure: create missing scripts for better compatibility

Problem detected by Ole Gabriel Stein <[email protected]> with the
2.3.0 release tarball. Thanks for the bug report.

Author: didier-barvaux

Makefile.am

@@ -122,6 +122,8 @@ endif
 TESTS = $(TESTS_CODE_COVERAGE)
 
 distclean-local:
+	$(RM) ltmain.sh missing test-driver config.guess
+	$(RM) depcomp compile install-sh config.sub
 	$(RM) output.zcov
 	$(RM) -r coverage-report/
 

autogen.sh

@@ -58,7 +58,7 @@ run aclocal
 run libtoolize --force
 run autoconf
 run autoheader
-run automake --add-missing
+run automake --add-missing --force-missing
 
 cd "${OLD_PWD}" >/dev/null