Bug 1903168 - Properly copy host rust programs to $DIST. r=firefox-build-system-reviewers,nalexander

Differential Revision: https://phabricator.services.mozilla.com/D214059

config/makefiles/target_binaries.mk

@@ -14,7 +14,7 @@ PROGRAMS_TARGET := target
 INSTALL_TARGETS += PROGRAMS
 endif
 
-ifneq (,$(strip $(HOST_SIMPLE_PROGRAMS)))
+ifneq (,$(strip $(HOST_SIMPLE_PROGRAMS)$(HOST_RUST_PROGRAMS)))
 HOST_PROGRAMS_EXECUTABLES = $(HOST_SIMPLE_PROGRAMS) $(HOST_RUST_PROGRAMS)
 HOST_PROGRAMS_DEST ?= $(DIST)/host/bin
 HOST_PROGRAMS_TARGET = host