($(CONFIGURE_TARGET_MODULES)): Set CONFIG_SITE to a non-existent file since...

($(CONFIGURE_TARGET_MODULES)): Set CONFIG_SITE to a
non-existent file since /dev/null loses with bash 2.0/autoconf 2.12.

From-SVN: r18655

Makefile.in

@@ -1167,11 +1167,13 @@ $(CONFIGURE_TARGET_MODULES):
 	      libsrcdir="$$s/$${dir}"; \
 	    fi; \
 	    if [ -f $${libsrcdir}/configure ] ; then \
-	      CONFIG_SITE=/dev/null $(SHELL) $${libsrcdir}/configure \
+	      rm -f no-such-file; \
+	      CONFIG_SITE=no-such-file $(SHELL) $${libsrcdir}/configure \
 		$(CONFIG_ARGUMENTS) $${srcdiroption} \
 		--with-target-subdir="$(TARGET_SUBDIR)"; \
 	    else \
-	      CONFIG_SITE=/dev/null $(SHELL) $$s/configure \
+	      rm -f no-such-file; \
+	      CONFIG_SITE=no-such-file $(SHELL) $$s/configure \
 		$(CONFIG_ARGUMENTS) $${srcdiroption} \
 		--with-target-subdir="$(TARGET_SUBDIR)"; \
 	    fi; \