allow warnings in embedding crate, prevent constant rebuild of embedd…

…ing crate

the embedding crate contains 1800+ lines of types from an external library, most
of which are not used or "rust"ically named. the former will change eventually,
but we have no control over the naming.

Makefile.in

@@ -347,13 +347,14 @@ libservo.dummy: $(DEPS_servo)
 	$(Q)$(RUSTC) $(RFLAGS_servo) $< --crate-type dylib,rlib
 	touch libservo.dummy
 
-RFLAGS_embedding = $(strip $(CFG_RUSTC_FLAGS)) $(addprefix -L $(B)src/,$(DEPS_SUBMODULES)) -L $(B)src/components/gfx -L $(B)src/components/util -L $(B)src/components/net -L $(B)src/components/script -L $(B)src/components/style -L $(B)src/components/msg -L $(B).. -L $(B)src/components/main -L $(B)src/components/macros
+RFLAGS_embedding = $(strip $(CFG_RUSTC_FLAGS)) $(addprefix -L $(B)src/,$(DEPS_SUBMODULES)) -L $(B)src/components/gfx -L $(B)src/components/util -L $(B)src/components/net -L $(B)src/components/script -L $(B)src/components/style -L $(B)src/components/msg -L $(B).. -L $(B)src/components/main -L $(B)src/components/macros -A non_camel_case_types -A unused_variable
 SRC_embedding = $(call rwildcard,$(S)src/components/embedding/,*.rs)
 CRATE_embedding = $(S)src/components/embedding/embedding.rs
 
 servo-embedding: libservo.dummy $(SRC_embedding) $(CRATE_embedding)
 	@$(call E, compile: $@)
 	$(Q)$(RUSTC) $(RFLAGS_embedding) $(CRATE_embedding) --crate-type dylib,rlib
+	touch servo-embedding
 else
 servo:  $(DEPS_servo)
 	@$(call E, compile: $@)