fixup! makefiles: Add mechanism to build modules through Cargo

Code duplicated during editing

makefiles/cargo-targets.inc.mk

@@ -1,16 +1,3 @@
-# Flags that need to be added to the RIOT_CFLAGS passed to cargo in order to
-# make bindgen happy
-CARGO_EXTRACFLAGS ?=
-
-# Setting anything other than debug or release will necessitate additional -Z
-# unstable-options as of 2021-03 nightlies.
-CARGO_PROFILE ?= debug
-# As long as C2Rust and riot-wrappers require nightly, the only alternative
-# here is to pick a particular nightly when something breaks.
-CARGO_CHANNEL ?= nightly
-
-CARGO_LIB = target/$(CARGO_TARGET)/${CARGO_PROFILE}/lib$(APPLICATION_RUST_MODULE).a
-
 $(CARGO_LIB): $(RIOTBUILD_CONFIG_HEADER_C) $(BUILDDEPS) FORCE
 	$(Q)[ x"${CARGO_TARGET}" != x"" ] || (echo "Error: No CARGO_TARGET was set for this platform"; exit 1)
 	$(Q)CC= CFLAGS= CPPFLAGS= CXXFLAGS= RIOT_CC="${CC}" RIOT_CFLAGS="$(CFLAGS_WITH_MACROS) $(INCLUDES) $(CARGO_EXTRACFLAGS)" cargo +$(CARGO_CHANNEL) build --target $(CARGO_TARGET) `if [ x$(CARGO_PROFILE) = xrelease ]; then echo --release; else if [ x$(CARGO_PROFILE) '!=' xdebug ]; then echo "--profile $(CARGO_PROFILE)"; fi; fi` $(CARGO_OPTIONS)