FS-10056: Fix modcheck.sh invokation

modcheck.sh gets called by build/Makefile when doing "make install" with
parameter "$(modulesdir)". This is fine when the install is done on a
live system. But when "make install" was called with a "$DESTDIR" then
this won't work, as the correct path would then be
"$(DESTDIR)$(modulesdir)". So add "$(DESTDIR)" in front.
Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>

build/Makefile.am

@@ -71,7 +71,7 @@ install:
 	@echo " +                                                 +"
 	@echo " +-------------------------------------------------+"
 	@cat $(switch_srcdir)/cluecon2.tmpl
-	@sh $(switch_srcdir)/build/modcheck.sh $(modulesdir)
+	@sh $(switch_srcdir)/build/modcheck.sh $(DESTDIR)$(modulesdir)
 
 .PHONY: check dvi html info install-data \
         install-dvi install-exec install-html install-info install-pdf install-ps installcheck installdirs pdf \