auto merge of #20437 : ranma42/rust/fix-make-install, r=alexcrichton

After 8b3c676 the `make install`
command fails if docs are not disabled through CFG_DISABLE_DOCS,
because now the `install` target uses
../../tmp/dist/$(DOC_PKG_NAME)-$(CFG_BUILD)/install.sh

Instead of explicitly depending on
dist/$(PKG_NAME)-$(CFG_BUILD).tar.gz, the `prepare_[un]install`
targets now depend on `dist-tar-bins`, which packages the appropriate
dist archives depending on the configuration.

Author: bors

mk/install.mk

@@ -28,11 +28,7 @@ endif
 # Remove tmp files because it's a decent amount of disk space
 	$(Q)rm -R tmp/dist
 
-ifeq ($(CFG_DISABLE_DOCS),)
-prepare_install: dist/$(PKG_NAME)-$(CFG_BUILD).tar.gz dist/$(DOC_PKG_NAME)-$(CFG_BUILD).tar.gz | tmp/empty_dir
-else
-prepare_install: dist/$(PKG_NAME)-$(CFG_BUILD).tar.gz | tmp/empty_dir
-endif
+prepare_install: dist-tar-bins | tmp/empty_dir
 
 uninstall:
 ifeq (root user, $(USER) $(patsubst %,user,$(SUDO_USER)))
@@ -48,7 +44,7 @@ endif
 # Remove tmp files because it's a decent amount of disk space
 	$(Q)rm -R tmp/dist
 
-prepare_uninstall: dist/$(PKG_NAME)-$(CFG_BUILD).tar.gz | tmp/empty_dir
+prepare_uninstall: dist-tar-bins | tmp/empty_dir
 
 .PHONY: install prepare_install uninstall prepare_uninstall