Add Makefile trigger for forcing clean-rust to happen.

Makefile.in

@@ -83,13 +83,18 @@ $(CFG_RUSTC):
 
 clean-rust:
 	$(MAKE) -C "$(CFG_BUILD_DIR)src/compiler/rust" CFG_RUSTC_FLAGS="" RUSTFLAGS="" clean
+
 else
 $(CFG_RUSTC):
 
 clean-rust:
 
 endif
 
+src/compiler/rust-auto-clean-stamp: $(S)src/compiler/rust-auto-clean-trigger
+	$(Q)$(MAKE) clean-rust
+	touch $@
+
 rust: $(CFG_RUSTC)
 
 # Strip off submodule paths to determine "raw" submodule names.
@@ -222,7 +227,7 @@ include $(S)mk/clean.mk
 
 .DEFAULT_GOAL := all
 .PHONY:	all
-all:    servo package
+all: src/compiler/rust-auto-clean-stamp servo package
 
 # Servo helper libraries
 

src/compiler/rust-auto-clean-trigger

@@ -0,0 +1,4 @@
+# If this file is modified, then rust will be forcibly cleaned and then rebuilt.
+# The actual contents of this file do not matter, but to trigger a change on the
+# build bots then the contents should be changed so git updates the mtime.
+2013-07-09